Biological Clocks - Deepstash
Biological Clocks

Biological Clocks

Endogenous rhythms exist because the body has biological clocks that keep time. Biological clocks can be adjusted by environmental cues, such as changes in temperature.

In humans, the Suprachiasmatic Nucleus (SCN) is the main biological clock that regulates circadian rhythms of sleep. The SCN lies in the brain’s hypothalamus. When light stimulates receptors in the retina of the eye, the receptors send signals to the SCN. The SCN then sends signals to the nearby Pineal Gland, which secretes Melatonin, a hormone that regulates the sleep cycle.

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