This hormone is produced in response to the absence of light in the environment,and is associated with circadian rhythms.
A) serotonin
B) acetylcholine
C) melatonin
D) dopamine

Question

Quizplus · Accepted Answer

Melatonin is produced by the pineal gland in response to darkness and is involved in regulating the body's circadian rhythms, including sleep-wake cycles. Serotonin, acetylcholine, and dopamine are all neurotransmitters involved in various aspects of brain function, but are not specifically associated with circadian rhythms.

This Hormone Is Produced in Response to the Absence of Light