Light alerts the biological clock to slow down the secretion of which hormone that promotes sleep?
A) epinephrine
B) corticoids
C) progesterone
D) melatonin

Question

Quizplus · Accepted Answer

Melatonin is the hormone that promotes sleep and is secreted by the pineal gland. Light exposure suppresses the secretion of melatonin, which in turn signals the biological clock to slow down and prepare for wakefulness.

Light Alerts the Biological Clock to Slow Down the Secretion