Which part of the human brain regulates the circadian rhythm?
Hypothalamus
The hypothalamus, specifically the suprachiasmatic nucleus (SCN), regulates the body's circadian rhythm — the roughly 24-hour internal clock that controls sleep-wake cycles, hormone release, body temperature, and other functions.
The SCN receives light signals from the retina and synchronises the body's biological clock with the day-night cycle.
The cerebellum coordinates movement, the medulla oblongata controls autonomic functions like breathing, and the thalamus relays sensory signals — none of these regulate the circadian rhythm.
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