Seasonal rhythms are under the control of ________ secreted by cells within the ________.
A) melatonin; pineal gland
B) dopamine; hypothalamus
C) melanopsin; preoptic hypothalamus
D) oxytocin; pituitary
E) melatonin; retina

Question

Quizplus · Accepted Answer

Seasonal rhythms, such as reproductive cycles, hibernation, and migration, are controlled by the hormone melatonin secreted by cells within the pineal gland. Melatonin levels increase in response to darkness and decrease in response to light, which helps regulate the circadian rhythm and the timing of seasonal behaviors.

Seasonal Rhythms Are Under the Control of ________ Secreted by Cells