Question

light alerts the biological clock to cease secreting which hormone that promotes sleep?
multiple choice
corticoids
progesterone
epinephrine
melatonin

Explanation:

Melatonin is a hormone that promotes sleep and its secretion is inhibited by light which signals the biological clock. Corticoids are related to stress - response, progesterone is a female sex - related hormone, and epinephrine is involved in the fight - or - flight response.

Answer:

D. melatonin