What is the primary stimulus that regulates the "biological clock" which controls circadian rhythms?
A) light
B) taste
C) smell
D) touch

Question

Quizplus · Accepted Answer

The primary stimulus that regulates the biological clock and controls circadian rhythms is light. Specifically, the cells in the retina of the eye contain special receptors that are sensitive to light, and they transmit this information to the suprachiasmatic nucleus (SCN) in the brain, which serves as the master clock that regulates the body's internal clock.

What Is the Primary Stimulus That Regulates the "Biological Clock