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ENDOCRINE SYSTEM AND ADOLESCENCE - Q&A

Multiple Choice Questions :

1. Put a tick mark (✓) against the correct alternative in the following statements :

(a) Cortisone hormone is secreted by :
(i) Medulla of adrenal     (ii) Cortex of adrenal
(iii) Pancreas                 (iv) Thyroid
Answer: (ii) Cortex of adrenal
Explanation: The adrenal glands have two parts. The outer part, called the cortex, secretes cortisone, while the inner part, the medulla, secretes adrenaline.

(b) Which one of the following hormones stimulates the breakdown of glycogen in the liver into glucose :
(i) Insulin             (ii) Adrenaline
(iii) Glucagon       (iv) Thyroxine
Answer: (iii) Glucagon
Explanation: Glucagon is secreted by the pancreas. Its function is to stimulate the breakdown of glycogen stored in the liver back into glucose to raise blood sugar levels.

(c) Which one of the following hormones converts excess of glucose into glycogen :
(i) Glucagon       (ii) Thyroxine
(iii) Insulin          (iv) Adrenaline
Answer: (iii) Insulin
Explanation: Insulin, secreted by the pancreas, lowers blood glucose levels by converting extra glucose into glycogen to be stored in the liver and muscles.

(d) Which one of the following glands is also called master gland :
(i) Pituitary gland     (ii) Adrenal gland
(iii) Thyroid gland     (iv) Ovary
Answer: (i) Pituitary gland
Explanation: The pituitary gland is located below the brain and secretes hormones that regulate the activity of other endocrine glands, earning it the title "master gland".

(e) The emergency hormone to face the danger or to fight is secreted by :
(i) Islets of Langerhans     (ii) Adrenal cortex
(iii) Pituitary                          (iv) Adrenal medulla
Answer: (iv) Adrenal medulla
Explanation: The adrenal medulla secretes Adrenaline, which is known as the "fight or flight" hormone because it prepares the body for emergency situations.

Short Answer Questions :

1. What is a hormone ?
Answer: Hormone is a chemical substance secreted from an endocrine gland, which is directly poured into the blood stream and acts on a target organ or cells to perform specific functions.

2. Which one of the following endocrine glands produces its hormone in large quantities as a result of emotional stimulation ?
(a) Thyroid                        (b) Islets of Langerhans
(c) Adrenal medulla           (d) Adrenal cortex
Answer: (c) Adrenal medulla
Explanation: The adrenal medulla secretes adrenaline when a person is under severe stress, anger, or emotional stimulation to prepare the body to face the situation.

3. In table given below, fill in the blanks by naming endocrine glands, the hormones they secrete, and the function they perform in a normal person.

S. No Name of the gland Hormone produced Function
1. Thyroid Thyroxine Controls the metabolic rate
2. Pancreas Insulin Regulates (lowers) the amount of sugar in the blood
3. Adrenal (Medulla) Adrenaline Prepares the body for action
4. Pituitary Growth hormone Speeds up growth

4. In humans, increased thyroxine production results in (tick the correct answer) :
(a) Increased metabolism     (b) Decreased metabolism
(c) Dwarfism                           (d) Cretinism
Answer: (a) Increased metabolism
Explanation: Thyroxine regulates the body's metabolic rate. Oversecretion leads to an increased metabolic rate, increased heart beat, and restlessness.

5. Match the items in Column A with those in Column B.

Column A Column B (Correct Match)
(a) Cretinism (ii) Defective development of child
(b) Diabetes mellitus (v) Insufficient insulin in blood
(c) Increased metabolic rate (iii) Oversecretion of thyroxine
(d) Simple goitre (iv) Insufficient iodine in food
(e) Growth hormone (i) Pituitary gland

6. Name the source and the function of each of the following hormones :

Hormone Source Function
(a) Glucagon Pancreas (Islets of Langerhans) Stimulates the breakdown of glycogen in the liver to glucose (raises blood sugar).
(b) Thyroxine Thyroid Gland Controls the metabolic rate and stimulates growth in infants.
(c) Adrenaline Adrenal Medulla Prepares body for emergency (fight or flight) by increasing heart beat and energy.
(d) Insulin Pancreas (Islets of Langerhans) Lowers blood glucose by converting extra glucose to glycogen.
(e) Cortisone Adrenal Cortex Influences carbohydrate, fat, and protein metabolism.

7. What is the difference between an exocrine gland and an endocrine gland ?
Answer:
1. Exocrine glands have ducts. They send their secretions (like saliva) through these ducts directly to the target organs (e.g., Salivary glands).
2. Endocrine glands are ductless glands. They pour their secretions (hormones) directly into the blood stream, which then carries them to the target organs (e.g., Thyroid gland).

8. Why pituitary gland is called "master gland" ?
Answer: The pituitary gland is called the "master gland" because it secretes several hormones that regulate and control the activity of other endocrine glands in the body.

9. Briefly write about the importance of physical hygiene during adolescence.
Answer: During adolescence, the increased activity of sweat glands and sebaceous (oil) glands can lead to body odour, acne, and pimples. Therefore, personal hygiene is very important to maintain health. Adolescents should bathe regularly to keep the skin clean and avoid infections. Girls specifically need to maintain hygiene during menstruation to avoid infections.

10. Briefly discuss the ways and means which can be practiced to overcome stress.
Answer: Stress management is essential for well-being. Ways to overcome stress include:
1. Yoga: Combines physical poses and breathing to reduce stress.
2. Exercise: Activities like running or playing sports (30-45 mins) improve health and reduce stress.
3. Proper sleep schedule: Helps in reducing stress.
4. Reading and Hobbies: Reading or practicing hobbies like music or painting calms the mind.
5. Positive Thinking: Being a positive thinker helps in interactions.
6. Deep breathing and Meditation: Invokes relaxation.
7. Time Management: Getting organized helps plan work better and reduces pressure.

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Multiple Choice Questions - Test your understanding with these MCQs. Click "Show Answer" to reveal the correct answer.

Question 1What is the primary difference between exocrine and endocrine glands?

Correct Answer: Exocrine glands have ducts, while endocrine glands are ductless

Question 2Where are hormones poured immediately after being secreted by endocrine glands?

Correct Answer: Directly into the blood stream

Question 3Which gland is specifically mentioned as being situated on either side of the windpipe?

Correct Answer: Thyroid gland

Question 4The hormone thyroxine is characterized as containing which specific element?

Correct Answer: Iodine

Question 5Which ailment is caused by the enlargement of the thyroid gland due to insufficient iodine?

Correct Answer: Simple goitre

Question 6What is the result of 'cretinism' in a child?

Correct Answer: Physical and mental retardation

Question 7Which condition in adults is marked by general sluggishness and swelling on the face and hands?

Correct Answer: Myxoedema

Question 8Where are the adrenal glands located in the human body?

Correct Answer: Like caps over the kidneys

Question 9Which part of the adrenal gland secretes the 'emergency hormone' adrenaline?

Correct Answer: Medulla

Question 10Why is adrenaline often called the 'fight or flight' hormone?

Correct Answer: It prepares the body to face danger or flee

Question 11Which hormone is the most well-known secretion of the adrenal cortex?

Correct Answer: Cortisone

Question 12The pancreas contains clusters of hormone-secreting cells known as:

Correct Answer: Islets of Langerhans

Question 13What is the primary function of insulin in the human body?

Correct Answer: To lower glucose levels in the blood stream

Question 14Insufficient secretion of insulin leads to which medical condition?

Correct Answer: Diabetes mellitus

Question 15Which hormone acts oppositely to insulin by raising the sugar level in the blood?

Correct Answer: Glucagon

Question 16Which gland is referred to as the 'master gland'?

Correct Answer: Pituitary

Question 17What occurs when there is an excess secretion of growth hormone during adolescent years?

Correct Answer: Gigantism

Question 18Which hormone produced by the pituitary stimulates the thyroid gland?

Correct Answer: TSH (Thyroid-stimulating hormone)

Question 19What is the definition of 'adolescence' as per the text?

Correct Answer: The stage of life leading to reproductive maturity

Question 20The term 'adolescence' is derived from a Latin word meaning what?

Correct Answer: To grow into maturity

Question 21What is the 'Adam's apple' found in adolescent boys?

Correct Answer: The protruding part of the throat caused by the growing larynx

Question 22Increased activity of which glands leads to acne and pimples during adolescence?

Correct Answer: Sweat and Sebaceous glands

Question 23What are the male sex hormones collectively called?

Correct Answer: Androgens

Question 24Which process is characterized by the periodic breakdown of the lining of the uterus in females?

Correct Answer: Menstruation

Question 25According to the text, what is the scientific cause of depression and mood swings during adolescence?

Correct Answer: Dramatic increase in hormone levels affecting the brain

Question 26Which stage follows adolescence, where an individual attains full physical growth and emotional stability?

Correct Answer: Adulthood

Question 27How does exercise help in stress management?

Correct Answer: By making one feel healthier and more in control of life

Question 28Which practice combines physical poses, controlled breathing, and meditation to reduce stress?

Correct Answer: Yoga

Question 29What is the typical interval for regular menstrual periods?

Correct Answer: 28 days

Question 30Which hormone converts extra glucose into glycogen for storage in the liver?

Correct Answer: Insulin

Question 31Which gland helps regulate the salt and water balance in the body through its cortical hormones?

Correct Answer: Adrenal

Question 32What is the primary role of FSH (Gonad-stimulating hormone) from the pituitary?

Correct Answer: To stimulate the ovaries and testes to secrete sex hormones

Question 33Which of these is a symptom of a diabetic person?

Correct Answer: High concentration of sugar in blood and frequent urination

Question 34During an emergency, adrenaline increases which of the following?

Correct Answer: Heart beat and respiration rate

Question 35What is 'puberty'?

Correct Answer: The stage where a person becomes capable of producing children

Question 36Why is the use of iodised salt recommended?

Correct Answer: Because iodine is required for the production of thyroxine

Question 37Which hormone is responsible for the contraction of uterus muscles during childbirth?

Correct Answer: Pituitary hormones

Question 38What is defined as 'what you feel when you have to handle more than you are used to'?

Correct Answer: Stress

Question 39Which of these is NOT a suggested way to manage stress in the text?

Correct Answer: Avoiding all social contact

Question 40Secondary sexual characteristics in girls include which of the following?

Correct Answer: Development of breasts

Question 41What is the location of the pituitary gland?

Correct Answer: Below the brain

Question 42Which hormone stimulates the breakdown of glycogen into glucose?

Correct Answer: Glucagon

Question 43What does thyroxine do to the body's activities?

Correct Answer: Speeds up the rate of most activities

Question 44Which gland is both a digestive gland and an endocrine gland?

Correct Answer: Pancreas

Question 45A 'wet dream' refers to the spontaneous discharge of what?

Correct Answer: Semen

Question 46What is the main androgen (male sex hormone)?

Correct Answer: Testosterone

Question 47During adolescence, which gender initially grows faster in height?

Correct Answer: Girls

Question 48Which of the following is a result of insufficient growth hormone?

Correct Answer: Dwarfism

Question 49What physical change is common to both boys and girls during adolescence?

Correct Answer: Increase in height

Question 50Hormones are described as being secreted in what quantity?

Correct Answer: Very small quantity
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True or False Questions - Determine whether each statement is true or false. Click "Show Answer" to reveal the correct answer.

Statement 1The human body has two main types of glands: exocrine and endocrine.

Correct Answer: True

Statement 2Exocrine glands are called ductless glands.

Correct Answer: False

Statement 3Endocrine glands send their secretions through ducts directly to target organs.

Correct Answer: False

Statement 4The secretions of endocrine glands are called hormones.

Correct Answer: True

Statement 5Hormones are poured directly into the blood stream.

Correct Answer: True

Statement 6Hormones are produced in very large quantities by the glands.

Correct Answer: False

Statement 7The thyroid gland is situated on either side of the windpipe.

Correct Answer: True

Statement 8Thyroxine is an iodine-containing protein.

Correct Answer: True

Statement 9Thyroxine hormone slows down the rate of body activities.

Correct Answer: False

Statement 10Insufficient secretion of thyroxine causes simple goitre.

Correct Answer: True

Statement 11Simple goitre appears as a swelling in the neck.

Correct Answer: True

Statement 12Cretinism is a condition caused by thyroid deficiency in adults.

Correct Answer: False

Statement 13Myxoedema is a condition seen in children with thyroid deficiency.

Correct Answer: False

Statement 14Iodised salt is recommended to ensure the production of thyroxine.

Correct Answer: True

Statement 15Oversecretion of thyroxine leads to an increased heart beat.

Correct Answer: True

Statement 16The adrenal glands are located like caps over the kidneys.

Correct Answer: True

Statement 17The adrenal medulla is the peripheral part of the adrenal gland.

Correct Answer: False

Statement 18The adrenal medulla secretes adrenaline.

Correct Answer: True

Statement 19Adrenaline is also known as the 'emergency hormone'.

Correct Answer: True

Statement 20Adrenaline is called the 'fight or flight' hormone.

Correct Answer: True

Statement 21Adrenaline decreases the rate of respiration.

Correct Answer: False

Statement 22Adrenaline causes the liver to release more glucose into the blood.

Correct Answer: True

Statement 23The adrenal cortex secretes the hormone cortisone.

Correct Answer: True

Statement 24Cortical hormones regulate salt and water balance in the body.

Correct Answer: True

Statement 25The pancreas is situated behind the stomach.

Correct Answer: True

Statement 26The endocrine part of the pancreas is called the Islets of Langerhans.

Correct Answer: True

Statement 27The pancreas secretes the hormones insulin and glucagon.

Correct Answer: True

Statement 28Insulin raises the glucose level in the blood stream.

Correct Answer: False

Statement 29Insulin converts extra glucose into glycogen for storage.

Correct Answer: True

Statement 30Insufficient secretion of insulin causes diabetes mellitus.

Correct Answer: True

Statement 31A diabetic person usually gains weight and becomes very strong.

Correct Answer: False

Statement 32Glucagon stimulates the breakdown of glycogen into glucose.

Correct Answer: True

Statement 33The pituitary gland is located below the brain.

Correct Answer: True

Statement 34The pituitary gland is called the 'master gland'.

Correct Answer: True

Statement 35Insufficient growth hormone in childhood causes gigantism.

Correct Answer: False

Statement 36TSH stimulates the thyroid gland to secrete thyroxine.

Correct Answer: True

Statement 37The pituitary gland plays no role in the birth process.

Correct Answer: False

Statement 38The pituitary gland secretes FSH, which stimulates the gonads.

Correct Answer: True

Statement 39Growth begins only when a person reaches adolescence.

Correct Answer: False

Statement 40Adolescence is the stage between childhood and adulthood.

Correct Answer: True

Statement 41The term 'adolescence' is derived from a Latin word meaning 'to grow into maturity'.

Correct Answer: True

Statement 42An adolescent is considered a fully grown adult.

Correct Answer: False

Statement 43Growth during adolescence is primarily controlled by hormones.

Correct Answer: True

Statement 44A sudden increase in height is a visible change during adolescence.

Correct Answer: True

Statement 45Initially, boys grow faster than girls during adolescence.

Correct Answer: False

Statement 46The larynx is also known as the voice box.

Correct Answer: True

Statement 47Boys develop a high-pitched voice during adolescence.

Correct Answer: False

Statement 48The 'Adam's apple' is a protruding part of the throat in boys.

Correct Answer: True

Statement 49The secretion of sweat and sebaceous glands increases during adolescence.

Correct Answer: True

Statement 50Sebaceous glands are also known as oil glands.

Correct Answer: True
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Fill in the Blanks - Complete the sentences by filling in the missing words. Click "Show Answer" to check your response.

Question 1The human body has two types of glands: the exocrine glands and the ______ glands.

Correct Answer: endocrine

Question 2The exocrine glands send their secretions through ______ directly to the target organs.

Correct Answer: ducts

Question 3Endocrine glands are also known as ______ glands because they pour secretions directly into the blood.

Correct Answer: ductless

Question 4The chemical substances secreted by endocrine glands are called ______.

Correct Answer: hormones

Question 5A ______ is a chemical substance that acts on a specific target organ or cells.

Correct Answer: hormone

Question 6The ______ gland is a bilobed gland situated on either side of the windpipe.

Correct Answer: thyroid

Question 7Thyroid gland is located just below the ______.

Correct Answer: larynx

Question 8The thyroid gland secretes the hormone ______.

Correct Answer: thyroxine

Question 9Thyroxine is a protein that contains the element ______.

Correct Answer: iodine

Question 10The hormone thyroxine speeds up the rate of most ______ activities of the body.

Correct Answer: metabolic

Question 11Insufficient secretion of thyroxine can cause an ailment called simple ______.

Correct Answer: goitre

Question 12Simple goitre appears as a ______ in the neck.

Correct Answer: swelling

Question 13Goitre occurs due to insufficient ______ in our daily food.

Correct Answer: iodine

Question 14The ailment caused by thyroid deficiency in children, leading to physical and mental retardation, is ______.

Correct Answer: cretinism

Question 15The use of ______ salt is recommended to prevent thyroid deficiencies.

Correct Answer: iodised

Question 16In adults, insufficient thyroxine production leads to a condition called ______.

Correct Answer: myxoedema

Question 17Myxoedema is characterized by general ______ and swelling on the face and hands.

Correct Answer: sluggishness

Question 18Oversecretion of thyroxine causes an increased ______ rate and heart beat.

Correct Answer: metabolic

Question 19The ______ glands are located like caps over the two kidneys.

Correct Answer: adrenal

Question 20Each adrenal gland consists of a central ______ and a peripheral cortex.

Correct Answer: medulla

Question 21The adrenal medulla secretes ______.

Correct Answer: adrenaline

Question 22Adrenaline is often referred to as the ______ hormone.

Correct Answer: emergency

Question 23Adrenaline prepares the body for a '______ or flight' response.

Correct Answer: fight

Question 24Adrenaline increases the rate of ______ and heart beat.

Correct Answer: respiration

Question 25Adrenaline causes the liver to release more ______ into the blood for extra energy.

Correct Answer: glucose

Question 26The adrenal cortex secretes many hormones, the most well-known being ______.

Correct Answer: cortisone

Question 27Cortical hormones regulate the ______ and water balance in the body.

Correct Answer: salt

Question 28The ______ is a gland situated behind the stomach.

Correct Answer: pancreas

Question 29The hormone-secreting cells in the pancreas are called ______.

Correct Answer: Islets of Langerhans

Question 30The pancreas secretes two main hormones: insulin and ______.

Correct Answer: glucagon

Question 31The hormone ______ lowers the glucose level in the blood stream.

Correct Answer: insulin

Question 32Insulin converts extra glucose into ______ to be stored in the liver.

Correct Answer: glycogen

Question 33Insufficient secretion of insulin causes ______ mellitus.

Correct Answer: diabetes

Question 34A diabetic person excretes a great deal of ______ loaded with sugar.

Correct Answer: urine

Question 35Oversecretion of insulin can cause the glucose level to become dangerously ______.

Correct Answer: low

Question 36The hormone ______ stimulates the breakdown of glycogen into glucose.

Correct Answer: glucagon

Question 37The ______ gland is a pea-sized gland located below the brain.

Correct Answer: pituitary

Question 38The pituitary gland is also called the ______ gland.

Correct Answer: master

Question 39The ______ hormone (GH) regulates growth, especially during adolescent years.

Correct Answer: growth

Question 40Insufficient growth hormone causes ______.

Correct Answer: dwarfism

Question 41Excess secretion of growth hormone results in ______.

Correct Answer: gigantism

Question 42Thyroid-stimulating hormone (TSH) stimulates the thyroid to secrete ______.

Correct Answer: thyroxine

Question 43The pituitary secretes FSH, which stands for ______-stimulating hormone.

Correct Answer: gonad

Question 44FSH stimulates the ______ to secrete sex hormones.

Correct Answer: gonads

Question 45The pituitary gland produces hormones that cause ______ of the uterus during childbirth.

Correct Answer: contraction

Question 46A pituitary hormone stimulates the breasts to produce ______ for breastfeeding.

Correct Answer: milk

Question 47The period of life leading to reproductive maturity is called ______.

Correct Answer: adolescence

Question 48The word adolescence is derived from the Latin word ______, meaning to grow into maturity.

Correct Answer: adolescant

Question 49Adolescence is a transitional stage between ______ and adulthood.

Correct Answer: childhood

Question 50During adolescence, height increases because the ______ of the arms and legs elongate.

Correct Answer: bones
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Short Answer Questions - Practice concise answers to these questions. Click "Show Answer" to reveal the response.
Question 1

What are the two main types of glands in the human body?

Answer:
Exocrine and Endocrine
Question 2

Which type of gland sends secretions through ducts?

Answer:
Exocrine gland
Question 3

What is another name for endocrine glands?

Answer:
Ductless glands
Question 4

What are the secretions of endocrine glands called?

Answer:
Hormones
Question 5

How do hormones reach their target organs?

Answer:
Through the blood
Question 6

Which gland is shaped like a butterfly and located in the neck?

Answer:
Thyroid gland
Question 7

Where is the thyroid gland situated relative to the windpipe?

Answer:
Either side
Question 8

What iodine-containing hormone does the thyroid secrete?

Answer:
Thyroxine
Question 9

Which element is essential for the production of thyroxine?

Answer:
Iodine
Question 10

What is the primary function of thyroxine?

Answer:
Controls metabolic rate
Question 11

What ailment is caused by an enlarged thyroid due to lack of iodine?

Answer:
Simple goitre
Question 12

What condition causes physical and mental retardation in children?

Answer:
Cretinism
Question 13

What is the adult condition caused by thyroid deficiency?

Answer:
Myxoedema
Question 14

What symptom is characteristic of myxoedema?

Answer:
General sluggishness
Question 15

What does oversecretion of thyroxine lead to?

Answer:
Increased metabolic rate
Question 16

Where are the adrenal glands located?

Answer:
Above the kidneys
Question 17

What are the two parts of the adrenal gland?

Answer:
Medulla and Cortex
Question 18

Which hormone is known as the 'emergency hormone'?

Answer:
Adrenaline
Question 19

Which part of the adrenal gland secretes adrenaline?

Answer:
Adrenal medulla
Question 20

What is adrenaline also called based on its response type?

Answer:
Fight or flight hormone
Question 21

Which hormone increases heart beat and blood pressure?

Answer:
Adrenaline
Question 22

What is the well-known hormone secreted by the adrenal cortex?

Answer:
Cortisone
Question 23

What balance do cortical hormones regulate in the body?

Answer:
Salt and water
Question 24

Where is the pancreas situated?

Answer:
Behind the stomach
Question 25

What are the hormone-secreting cells in the pancreas called?

Answer:
Islets of Langerhans
Question 26

Which pancreatic hormone lowers blood glucose levels?

Answer:
Insulin
Question 27

Into what does insulin convert extra glucose?

Answer:
Glycogen
Question 28

Where is glycogen stored in the body?

Answer:
Liver and muscles
Question 29

What disease is caused by insufficient insulin secretion?

Answer:
Diabetes mellitus
Question 30

Which hormone stimulates the breakdown of glycogen to glucose?

Answer:
Glucagon
Question 31

Which gland is located below the brain and is pea-sized?

Answer:
Pituitary gland
Question 32

What is the common nickname for the pituitary gland?

Answer:
Master gland
Question 33

What does Growth Hormone (GH) regulate?

Answer:
Physical growth
Question 34

What does insufficient growth hormone lead to?

Answer:
Dwarfism
Question 35

What does excess growth hormone lead to?

Answer:
Gigantism
Question 36

Which pituitary hormone stimulates the thyroid gland?

Answer:
TSH
Question 37

What is the function of FSH?

Answer:
Stimulates gonads
Question 38

Which gland plays an important role in the birth process?

Answer:
Pituitary gland
Question 39

What is the transitional stage between childhood and adulthood?

Answer:
Adolescence
Question 40

From which Latin word is 'adolescence' derived?

Answer:
Adolescant
Question 41

What does the Latin word 'adolescant' mean?

Answer:
To grow into maturity
Question 42

At what age range does adolescence typically begin?

Answer:
10 or 11
Question 43

What is the most visible physical change during adolescence?

Answer:
Increase in height
Question 44

Who initially grows faster during adolescence?

Answer:
Girls
Question 45

What is the protruding part of the throat in boys called?

Answer:
Adam's apple
Question 46

What kind of voice do girls generally develop?

Answer:
High pitched
Question 47

What causes acne and pimples during adolescence?

Answer:
Increased oil secretion
Question 48

What is the stage of reaching reproductive maturity called?

Answer:
Puberty
Question 49

What are the male sex hormones called collectively?

Answer:
Androgens
Question 50

What is the primary male sex hormone?

Answer:
Testosterone
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Long Answer Questions - Practice detailed answers to these comprehensive questions. Click "Show Answer" to reveal the response.
Question 1

Distinguish between exocrine and endocrine glands with examples and diagrams.

Answer:
The human body contains two main types of glands: 1. Exocrine Glands: These glands possess ducts to carry their secretions directly to target organs. Examples include salivary glands and the digestive part of the pancreas. 2. Endocrine Glands: These are ductless glands that pour their secretions (hormones) directly into the bloodstream, which carries them to target organs. Examples include the thyroid and pituitary glands.
Question 2

Define a hormone and list its general characteristics as described in the text.

Answer:
A hormone is a chemical substance secreted by an endocrine gland directly into the bloodstream to act on a specific target organ or cells. Characteristics include: 1. Secreted in very small quantities. 2. Carried by blood to all parts of the body. 3. Produces effects only in specific target parts. 4. Regulates various metabolic and physiological activities.
Question 3

Describe the location and secretion of the thyroid gland.

Answer:
The thyroid is a bilobed gland located in the neck, situated on either side of the windpipe (trachea), just below the larynx (voice box). It secretes the hormone thyroxine, which is an iodine-containing protein essential for regulating the body's metabolic rate and stimulating growth in infants.
Question 4

What are the effects of insufficient secretion of thyroxine in children and adults?

Answer:
Insufficient thyroxine leads to: 1. Simple Goitre: Enlargement of the thyroid appearing as a swelling in the neck, caused by iodine deficiency. 2. Cretinism: Occurs in children, causing physical and mental retardation and abnormal development. 3. Myxoedema: Occurs in adults, characterized by general sluggishness and swelling of the face and hands.
Question 5

Explain why the adrenal glands are essential for 'Fight or Flight' situations.

Answer:
The adrenal medulla secretes adrenaline, the 'emergency hormone,' during stress, fear, or anger. It prepares the body by: 1. Increasing heart beat and blood pressure. 2. Increasing the rate of respiration. 3. Increasing blood supply to muscles. 4. Releasing more glucose from the liver into the blood for extra energy. This allows a person to either face the danger (fight) or run away (flight).
Question 6

Describe the dual role of the pancreas as a gland.

Answer:
The pancreas is both an exocrine and an endocrine gland. 1. Exocrine role: It secretes digestive enzymes through ducts into the duodenum. 2. Endocrine role: It contains clusters of cells called Islets of Langerhans that secrete hormones directly into the blood, specifically insulin (to lower blood sugar) and glucagon (to raise blood sugar).
Question 7

How does insulin regulate blood glucose levels in the human body?

Answer:
Insulin lowers blood glucose in three ways: 1. It converts extra glucose into glycogen for storage in the liver and muscles. 2. It induces cells to burn extra glucose for heat and energy. 3. It causes cells to convert extra sugar into fat. Deficiency of insulin leads to Diabetes Mellitus, where blood sugar remains high and is excreted in urine.
Question 8

Explain why the pituitary gland is referred to as the 'Master Gland'.

Answer:
The pituitary gland, located below the brain, is called the 'Master Gland' because many of its hormones regulate the activity of other endocrine glands. For example, it secretes Thyroid-stimulating hormone (TSH) to control the thyroid and Gonad-stimulating hormone (FSH) to regulate the ovaries and testes.
Question 9

List the major hormones produced by the pituitary gland and their specific functions.

Answer:
1. Growth Hormone (GH): Regulates physical growth; deficiency causes dwarfism, excess causes gigantism. 2. Thyroid-stimulating hormone (TSH): Stimulates the thyroid to secrete thyroxine. 3. Gonad-stimulating hormone (FSH): Influences the production of sperms and ova. 4. Childbirth hormones: Cause uterine contractions and stimulate milk production in breasts.
Question 10

Define adolescence and explain its significance in human development.

Answer:
Adolescence is the period of life when the body undergoes development leading to reproductive maturity (typically between ages 10-19). Derived from the Latin 'adolescant' (to grow into maturity), it is a transitional stage between childhood and adulthood characterized by rapid physical growth and sexual maturity.
Question 11

What are the primary physical changes that occur in boys during adolescence?

Answer:
In boys: 1. Sudden increase in height and weight. 2. Broadening of shoulders and development of muscles. 3. Growth of the larynx resulting in a deeper voice and the 'Adam's apple'. 4. Growth of hair on the face (beard/moustache), chest, and legs. 5. Activation of testes to produce sperms.
Question 12

What are the primary physical changes that occur in girls during adolescence?

Answer:
In girls: 1. Rapid increase in height. 2. Broadening of hips and development of a curvaceous body shape. 3. Development of breasts. 4. High-pitched voice. 5. Onset of menstruation and activation of ovaries to produce eggs.
Question 13

Describe the role of sweat and sebaceous glands during adolescence.

Answer:
During adolescence, there is increased secretion from sweat glands and sebaceous (oil) glands. This often leads to the development of acne and pimples on the face, which is a very common and normal physical change for many young people during this period.
Question 14

Define puberty and identify the hormones responsible for it in both sexes.

Answer:
Puberty is the stage of adolescence where a person becomes capable of reproduction. It is triggered by sex hormones: 1. In Males: Androgens, primarily testosterone, produced by the testes. 2. In Females: Oestrogens, produced by the ovaries. These are activated by gonad-stimulating hormones from the pituitary gland.
Question 15

What are 'Secondary Sexual Characteristics'? Provide examples for males and females.

Answer:
These are physical features that distinguish the two sexes but are not directly part of the reproductive system. In males: facial hair growth and deepening of voice. In females: development of breasts and broadening of hips. Both are triggered by the onset of sex hormones at puberty.
Question 16

Explain the process and significance of menstruation in females.

Answer:
Menstruation is the monthly cycle characterized by bleeding from the vagina, caused by the breakdown of the lining of the womb (uterus). It typically occurs every 28 days and lasts about 5 days. It signifies reproductive maturity and the body's preparation for potential pregnancy.
Question 17

Discuss the emotional and psychological changes associated with adolescence.

Answer:
Adolescents often experience: 1. Self-consciousness regarding body growth. 2. Mood swings and depression caused by fluctuating hormone levels affecting the brain. 3. Anxiety about the future. 4. Increased influence of peer groups and a desire for independence. 5. Interest in the opposite sex.
Question 18

Why is personal hygiene particularly important during adolescence?

Answer:
Hygiene is crucial because: 1. Increased sweat and oil gland activity can lead to body odor and skin infections. 2. Proper care prevents acne and pimples. 3. For girls, maintaining hygiene during menstruation is essential to prevent infections. 4. Overall cleanliness promotes self-confidence and health.
Question 19

What is 'stress' and how does the body react to it physiologically?

Answer:
Stress is the feeling experienced when handling more demands than one is used to. Physiologically, the body reacts as if in danger: it releases hormones (like adrenaline) that speed up the heart rate, increase breathing rate, and provide a burst of energy. Prolonged stress can lead to physical health decline and depression.
Question 20

Detail five effective ways to manage stress as mentioned in the text.

Answer:
1. Yoga: Combines physical poses and meditation for relaxation. 2. Exercise: 30-45 minutes of activity like running or sports. 3. Proper Sleep: Maintaining a regular sleep schedule. 4. Positive Thinking: Focusing on pleasant interactions and laughing more. 5. Deep Breathing and Meditation: Calms the mind and invokes relaxation.
Question 21

What is the difference between simple goitre and cretinism?

Answer:
Both are caused by thyroxine deficiency, but: 1. Simple Goitre is the physical enlargement of the thyroid gland in the neck, primarily due to lack of iodine in diet. 2. Cretinism is a developmental disorder in children that results in both physical growth failure and mental retardation.
Question 22

Describe the location and components of the adrenal glands.

Answer:
The adrenal glands are located like caps on top of each kidney. Each gland consists of two distinct parts: an inner 'Medulla' which secretes adrenaline, and an outer 'Cortex' which secretes hormones like cortisone to regulate metabolism and salt balance.
Question 23

How does the adrenal cortex help the body adapt to stress?

Answer:
The adrenal cortex secretes hormones (cortical hormones) that influence the metabolism of carbohydrates, fats, and proteins. They also regulate salt and water balance, helping the body adapt to external stresses like extreme heat, cold, burns, or infections.
Question 24

Contrast the functions of insulin and glucagon.

Answer:
1. Insulin: Lowers blood sugar level by converting glucose to glycogen and encouraging cells to use glucose. 2. Glucagon: Raises blood sugar level by stimulating the liver to break down stored glycogen back into glucose. They act antagonistically to maintain stable blood sugar.
Question 25

What are the symptoms of Diabetes Mellitus?

Answer:
Symptoms include: 1. High concentration of sugar in the blood. 2. Frequent urination with urine containing sugar. 3. Excessive thirst due to water loss. 4. Weight loss and general weakness.
Question 26

What is the Adam's apple and why is it more prominent in boys?

Answer:
The Adam's apple is the protruding part of the throat formed by the growth of the larynx (voice box) during puberty. It is more prominent in boys because their voice boxes grow significantly larger than those of girls, leading to a deeper, coarser voice.
Question 27

Identify the gland responsible for the following: (a) Emergency response, (b) Master control, (c) Metabolic rate, (d) Blood sugar.

Answer:
(a) Adrenal Medulla (Adrenaline), (b) Pituitary Gland, (c) Thyroid Gland (Thyroxine), (d) Pancreas (Insulin/Glucagon).
Question 28

Describe the physical state of 'Adulthood' as the stage following adolescence.

Answer:
Adulthood is the stage where an individual attains full physical growth and emotional stability. Values are grounded, vision for the future dominates, and the individual takes on stable relationships, career pursuits, and social responsibilities.
Question 29

How do hormones affect the brain during adolescence?

Answer:
The dramatic increase in hormone levels during adolescence affects the parts of the brain that control emotions and moods. This is a scientific cause for the frequent mood swings, irritability, and depression experienced by many teenagers.
Question 30

Why is it important for adolescents to be careful about peer group influence?

Answer:
Adolescents tend to spend more time with peers and imitate their behavior to feel safe. This is a crucial age where bad company can lead to negative habits or addictions. Choosing positive friends is essential for healthy emotional and social development.
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Quick Review Flashcards - Click to flip and test your knowledge!
Question
What are the two types of glands in the human body?
Answer
Exocrine glands and endocrine glands.
Question
How do exocrine glands send their secretions to target organs?
Answer
Through ducts.
Question
Which type of gland is characterized by being 'ductless'?
Answer
Endocrine glands.
Question
How are the secretions of endocrine glands transported to target organs?
Answer
They are poured directly into the blood, which carries them to the target organs.
Question
What is the general term for the secretions produced by endocrine glands?
Answer
Hormones.
Question
Provide an example of an exocrine gland mentioned in the text.
Answer
Salivary glands or pancreas.
Question
What is the definition of a hormone?
Answer
A chemical substance secreted from an endocrine gland, which is directly poured into the blood stream and acts on a target organ or cells.
Question
Where is the thyroid gland located?
Answer
On either side of the wind pipe, just below the larynx.
Question
What is the name of the hormone secreted by the thyroid gland?
Answer
Thyroxine.
Question
Thyroxine is an iodine-containing _____.
Answer
protein
Question
What is the primary function of the hormone thyroxine?
Answer
It speeds up the rate of most of the activities of the body (controls the metabolic rate).
Question
What condition is caused by an insufficient amount of iodine in the daily diet?
Answer
Simple goitre.
Question
What is the main physical symptom of simple goitre?
Answer
An enlargement of the thyroid gland, appearing as a swelling in the neck.
Question
What condition, affecting children, is caused by insufficient secretion of thyroxine and results in abnormal development?
Answer
Cretinism.
Question
Myxoedema is a condition seen in adults due to insufficient production of which hormone?
Answer
Thyroxine.
Question
What are the symptoms of myxoedema in an adult?
Answer
General sluggishness, with swelling on the face and the hands.
Question
What are the effects of an oversecretion of thyroxine?
Answer
Enlargement of the gland, increased metabolic rate, increased heart beat, and general restlessness.
Question
Where are the adrenal glands located in the body?
Answer
They are like caps over the two kidneys.
Question
What are the two parts of each adrenal gland?
Answer
A central medulla and a peripheral cortex.
Question
Which part of the adrenal gland secretes adrenaline?
Answer
The adrenal medulla.
Question
What is another name for adrenaline, reflecting its function in stressful situations?
Answer
Emergency hormone.
Question
Adrenaline is often called the 'fight or flight' hormone because it prepares the body to face what kind of situations?
Answer
Emergency situations, such as danger or stress (physical or emotional).
Question
List two physiological effects of adrenaline release in the body.
Answer
Increased heart beat, increased rate of respiration, rise in blood pressure, or release of more glucose into the blood.
Question
Which part of the adrenal gland secretes the hormone cortisone?
Answer
The adrenal cortex.
Question
What is a key function of cortisone secreted by the adrenal cortex?
Answer
It influences carbohydrate, fat, and protein metabolism and regulates salt and water balance.
Question
Where is the pancreas located?
Answer
Behind the stomach.
Question
The pancreas has clusters of hormone-secreting cells known as the _____.
Answer
Islets of Langerhans
Question
What are the two hormones secreted by the Islets of Langerhans in the pancreas?
Answer
Insulin and glucagon.
Question
What is the primary function of insulin?
Answer
It lowers the glucose in the blood stream.
Question
In what form does insulin cause extra glucose to be stored in the liver and muscles?
Answer
Glycogen.
Question
What disease is caused by the insufficient secretion of insulin?
Answer
Diabetes mellitus.
Question
A person with _____ has a high concentration of sugar in the blood.
Answer
diabetes mellitus
Question
What is the function of the hormone glucagon?
Answer
It stimulates the breakdown of glycogen in the liver to glucose, thus it raises the sugar level in the blood.
Question
Where is the pituitary gland located?
Answer
Below the brain.
Question
Why is the pituitary gland often called the 'master gland'?
Answer
Because it secretes several hormones, some of which regulate the activity of other endocrine glands.
Question
What is the function of Growth Hormone (GH) secreted by the pituitary gland?
Answer
It regulates growth, especially in the adolescent years.
Question
What condition results from an excess secretion of growth hormone?
Answer
Gigantism.
Question
What condition results from an insufficient amount of growth hormone?
Answer
Dwarfism.
Question
Which pituitary hormone stimulates the thyroid gland to secrete thyroxine?
Answer
Thyroid-stimulating hormone (TSH).
Question
Which pituitary hormone stimulates the gonads (ovaries and testes) to secrete sex hormones?
Answer
Gonad-stimulating hormone (FSH).
Question
What role does a pituitary hormone play during child birth?
Answer
It produces hormones which cause contraction of the muscles of the uterus during child birth.
Question
Term: Adolescence
Answer
A transitional stage of physical and mental human development that is derived from a Latin word which means 'to grow into maturity'.
Question
What is the first and most visible change during adolescence?
Answer
A sudden and conspicuous increase in height.
Question
During adolescence, how does body shape generally change for boys?
Answer
Boys generally have longer bones, more muscles, and broader shoulders.
Question
During adolescence, how does body shape generally change for girls?
Answer
Girls have a curvaceous body and broader hips due to the enlargement of hip bones.
Question
What causes the voice to change and deepen in adolescent boys?
Answer
The larynx or the voice box begins to grow, leading to a larger voice box and a deep coarse voice.
Question
The protruding part of the throat in boys, which develops during adolescence, is called the _____.
Answer
Adam's apple
Question
Why do many adolescents get acne and pimples?
Answer
Due to the increased activity of sweat and sebaceous glands (oil glands).
Question
Term: Puberty
Answer
The period of life when the body undergoes development leading to reproductive maturity.
Question
Puberty is brought on by _____, which are produced by the ovaries and testes themselves.
Answer
sex hormones
Question
What is the main male sex hormone (androgen)?
Answer
Testosterone.
Question
What is the main female sex hormone?
Answer
Oestrogen.
Question
What stimulates the testes and ovaries to produce sex hormones at the start of puberty?
Answer
Gonad-stimulating hormones from the pituitary gland.
Question
Changes which have just been described constitute the person’s _____.
Answer
secondary sexual characteristics
Question
What term is used for the spontaneous discharge of semen during sleep in boys?
Answer
'wet dream'
Question
What is menstruation?
Answer
The bleeding from the vagina caused by the lining of the womb (uterus) breaking down.
Question
Approximately how often do menstrual periods occur?
Answer
At fairly regular intervals of about 28 days.
Question
What is a common emotional experience for adolescents due to changes in hormone levels?
Answer
Dramatic increase in the hormone level in the body, which affects the brain that control emotions and moods.
Question
The stage that follows adolescence and is characterized by a great amount of emotional stability is known as ____.
Answer
adulthood
Question
What is stress?
Answer
What you feel when you have to handle more than you are used to.