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Question (41)

QN0036112

41 A person suddenly faces a frightening situation. Which hormone prepares the body for rapid action?

(A) Insulin
(B) Adrenaline
(C) Thyroxin
(D) Cytokinin

Correct Answer: B

Explanation:

Adrenaline prepares the body to respond quickly to danger.

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Question (42)

QN0036113

42 When adrenaline is released into the blood, which combination of changes is expected?

(A) Heart rate and breathing rate increase
(B) Heart rate decreases and digestion increases
(C) Breathing stops and blood pressure falls
(D) All muscles become inactive

Correct Answer: A

Explanation:

Adrenaline increases heart rate and breathing rate to supply more oxygen to muscles.

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Question (43)

QN0036114

43 During an adrenaline response, blood flow to the digestive system and skin is reduced. What is the advantage?

(A) More blood can be diverted towards skeletal muscles
(B) Digestion becomes faster
(C) The body stops using oxygen
(D) Blood becomes completely stationary

Correct Answer: A

Explanation:

More blood is made available to skeletal muscles for rapid action.

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Question (44)

QN0036115

44 Iodine is essential for the production of which hormone?

(A) Insulin
(B) Thyroxin
(C) Adrenaline
(D) Growth hormone

Correct Answer: B

Explanation:

The thyroid gland requires iodine to synthesise thyroxin.

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Question (45)

QN0036116

45 A person has insufficient iodine in the diet. Which condition may result?

(A) Diabetes
(B) Goitre
(C) Dwarfism
(D) Reflex action

Correct Answer: B

Explanation:

Iodine deficiency can cause goitre.

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Question (46)

QN0036117

46 What is the major role of thyroxin mentioned in the chapter?

(A) Regulating carbohydrate, protein and fat metabolism
(B) Causing reflex actions
(C) Controlling pupil size only
(D) Producing digestive enzymes

Correct Answer: A

Explanation:

Thyroxin regulates carbohydrate, protein and fat metabolism.

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Question (47)

QN0036118

47 Growth hormone is secreted by the

(A) Thyroid gland
(B) Pancreas
(C) Pituitary gland
(D) Adrenal gland

Correct Answer: C

Explanation:

The pituitary gland secretes growth hormone.

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Question (48)

QN0036119

48 A deficiency of growth hormone during childhood can lead to

(A) Goitre
(B) Dwarfism
(C) Diabetes
(D) Increased blood sugar only

Correct Answer: B

Explanation:

Deficiency of growth hormone during childhood can cause dwarfism.

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Question (49)

QN0036120

49 A person's blood sugar level rises because the pancreas is not secreting enough of a particular hormone. Which hormone is involved?

(A) Insulin
(B) Thyroxin
(C) Adrenaline
(D) Auxin

Correct Answer: A

Explanation:

Insulin produced by the pancreas regulates blood sugar levels.

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Question (50)

QN0036121

50 Suppose blood sugar rises. According to the feedback mechanism described in the chapter, what should happen next?

(A) The pancreas produces more insulin
(B) Insulin secretion stops completely
(C) The thyroid stops producing thyroxin
(D) The spinal cord stops transmitting impulses

Correct Answer: A

Explanation:

When blood sugar rises, the pancreas produces more insulin; as blood sugar falls, insulin secretion decreases.

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Question (41)

41 A person suddenly faces a frightening situation. Which hormone prepares the body for rapid action?

Explanation:

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Question (42)

42 When adrenaline is released into the blood, which combination of changes is expected?

Explanation:

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Question (43)

43 During an adrenaline response, blood flow to the digestive system and skin is reduced. What is the advantage?

Explanation:

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Question (44)

44 Iodine is essential for the production of which hormone?

Explanation:

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Question (45)

45 A person has insufficient iodine in the diet. Which condition may result?

Explanation:

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Question (46)

46 What is the major role of thyroxin mentioned in the chapter?

Explanation:

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Question (47)

47 Growth hormone is secreted by the

Explanation:

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Question (48)

48 A deficiency of growth hormone during childhood can lead to

Explanation:

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Question (49)

49 A person's blood sugar level rises because the pancreas is not secreting enough of a particular hormone. Which hormone is involved?

Explanation:

Link:

Question (50)

50 Suppose blood sugar rises. According to the feedback mechanism described in the chapter, what should happen next?

Explanation:

Link:

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