The structure that serves as our biological clock that controls circadian rhythms is
A)the heart with its pace-maker cells.
B)the pituitary gland.
C)the pineal gland.
D)the suprachiasmatic nucleus.

Question

Quizplus · Accepted Answer

The suprachiasmatic nucleus is a small structure located in the hypothalamus that serves as the biological clock that controls circadian rhythms, including sleep-wake cycles. The pineal gland, also located in the brain, is influenced by the suprachiasmatic nucleus and secretes the hormone melatonin, which plays a role in regulating sleep. The heart with its pacemaker cells and the pituitary gland are not directly involved in regulating circadian rhythms.

The Structure That Serves as Our Biological Clock That Controls