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Which gland secretes melatonin and is regulated by the body's biological rhythm?

A.

Adrenal gland

B.

Pineal gland

C.

Pituitary gland

D.

Pancreas

Answer and Explanation

The Correct Answer is B

A. Adrenal gland: Produces cortisol and adrenaline; not melatonin.

B. Pineal gland: Secretes melatonin; controls circadian rhythms.

C. Pituitary gland: Master gland; does not secrete melatonin.

D. Pancreas: Produces insulin and glucagon; unrelated to sleep regulation.


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Related Questions

Correct Answer is B

Explanation

A. Causes the release of hormones that form the Graafian follicle: Hormones like FSH and LH stimulate the development of the Graafian follicle; ovulation is the release of an egg from it.

B. Normally occurs on day 14 of a 28-day cycle: Ovulation typically occurs mid-cycle around day 14.

C. Normally occurs on day 28 of a 28-day cycle: Day 28 is usually the end of the cycle when menstruation begins, not ovulation.

D. Is caused by the secretion of hCG: Ovulation is triggered by a surge in luteinizing hormone (LH), not hCG.


Correct Answer is A

Explanation

A. During labor, pressure of baby's head on cervix stimulates release of oxytocin:
This is a classic example of positive feedback-oxytocin increases uterine contractions, which increase pressure and stimulate more oxytocin release.

B. Menstrual cycle:
The menstrual cycle involves both positive and negative feedback mechanisms, but is not a pure example of positive feedback.

C. Blood glucose regulation:
This is an example of negative feedback involving insulin and glucagon.

D. Wake/sleep cycle:
This is regulated by circadian rhythms, not primarily a feedback loop of endocrine hormones.

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