Circadian rhythms are controlled by a biological clock, a teardrop-shaped cluster of cells called the:

Question

Quizplus · Accepted Answer

The suprachiasmatic nucleus is the teardrop-shaped cluster of cells that controls circadian rhythms in the brain. The pineal gland also plays a role in regulating circadian rhythms through the secretion of melatonin, but it is not the cluster of cells that controls these rhythms. The thalamus and hippocampus are not directly involved in controlling circadian rhythms.

Circadian Rhythms Are Controlled by a Biological Clock, a Teardrop-Shaped