Q41
Nicotine acts as a stimulant, because it mimics the effect of
Correct Answer
Option B
Solution
(b) Nicotine and acetylcholine share the same receptors - nicotinic cholinergic receptors.
Chemical Coordination and Integration
Q42
The mammalian corpus luteum produces
Correct Answer
Option B
Solution
(b) Corpus luteum produces progesterone, essential for continuation of pregnancy.
Q43
In human adult females, oxytocin causes strong uterine contractions during parturition.
Correct Answer
Option D
Solution
(d) Oxytocin stimulates the contraction of smooth muscles during labour.
Q44
According to the immunity theory of ageing, the process starts with the gradual atrophy and disappearance of
Correct Answer
Option C
Solution
(c) Ageing starts with gradual atrophy and disappearance of the thymus gland during middle age.
Q45
Which one of the following hormone stimulates the let-down release of milk from the mother's breasts when the baby is sucking?
Correct Answer
Option B
Solution
(b) Oxytocin released by posterior pituitary causes ejection of milk from mammary glands due to sucking by infant.
Q46
Hormones thyroxine, adrenaline and the pigment melanin are formed from
Correct Answer
Option C
Solution
(c) Thyroxine, adrenaline and melanin are formed from tyrosine through different metabolic pathways.
Q47
The most important component of the oral contraceptive pill is
Correct Answer
Option D
Solution
(d) Oral contraceptive pills contain progesterone (and estrogen) that suppress FSH and LH production preventing ovulation.
Q48
Calcitonin is a thyroid hormone which
Correct Answer
Option A
Solution
(a) Calcitonin lowers calcium and phosphate level of plasma by inhibiting bone degradation.
Q49
The gland that regresses with age is
Correct Answer
Option C
Solution
(c) Thymus gland is maximally developed at puberty, then begins to shrink with development of sex glands.
Q50
A temporary endocrine gland in the human body is:
Correct Answer
Option B
Solution
(b) Corpus luteum is the temporary endocrine gland formed in the ovary after ovulation.
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