_______________, a hormone involved in the regulation of circadian rhythms, is secreted by the pineal gland.
A) Norepinephrine
B) Testosterone
C) Estrogen
D) Melatonin

Question

Quizplus · Accepted Answer

Melatonin is the hormone involved in the regulation of circadian rhythms and is secreted by the pineal gland. Norepinephrine is a neurotransmitter involved in the stress response, while testosterone and estrogen are hormones involved in reproductive functions.

_______________, a Hormone Involved in the Regulation of Circadian Rhythms