What are the target cells of melatonin, and which hormone decreases their activity?
A) Hypothalamus, the activity of which is decreased by IGF-II.
B) Thymus, the activity of which is decreased by luteinising hormone.
C) The pineal gland, the activity of which is decreased by parathyroid hormone.
D) Suprachiasmatic nucleus, the activity of which is decreased by melatonin.
E) Adenohypophysis, the activity of which is decreased by progesterone.

Question

Quizplus · Accepted Answer

Melatonin primarily targets the suprachiasmatic nucleus (SCN) of the hypothalamus, which is involved in controlling circadian rhythms. Melatonin itself decreases the activity of the SCN, helping to regulate sleep-wake cycles.

What Are the Target Cells of Melatonin, and Which Hormone