What appears to be responsible for regulating the circadian rhythm?
A) amount of time spent sleeping
B) amount of time spent awake
C) cultural practices
D) exposure to light

Question

Quizplus · Accepted Answer

Exposure to light, particularly the darkness-to-light ratio, is responsible for regulating the circadian rhythm. Light exposure affects the secretion of melatonin, a hormone that helps regulate sleep-wake cycles.

What Appears to Be Responsible for Regulating the Circadian Rhythm