Melatonin
A) is secreted by the thymus gland.
B) is thought to increase the secretion of releasing hormones from the hypothalamus.
C) increases FSH and LH secretion.
D) may be controlled by changes in day length.
E) has all of these properties.

Question

Quizplus · Accepted Answer

Melatonin may be controlled by changes in day length. It is produced by the pineal gland in response to darkness and helps regulate sleep-wake cycles. It is not secreted by the thymus gland, does not increase the secretion of releasing hormones from the hypothalamus, and does not increase FSH and LH secretion.