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Circadian rhythm.

Illustration of the biological clock. Depending on sunlight perceived by the eye, signals are sent to the suprachiasmatic nucleus, home of the circadian clock, located in the hypothalamus, which controls various biological rhythms. The brain controls the secretion of melatonin (sleep hormone), which increases as light diminishes. (Photo by: Jacopin/BSIP/Universal Images Group via Getty Images)
Illustration of the biological clock. Depending on sunlight perceived by the eye, signals are sent to the suprachiasmatic nucleus, home of the circadian clock, located in the hypothalamus, which controls various biological rhythms. The brain controls the secretion of melatonin (sleep hormone), which increases as light diminishes. (Photo by: Jacopin/BSIP/Universal Images Group via Getty Images)
Circadian rhythm.
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Credit:
BSIP / Contributor
Editorial #:
1141934086
Collection:
Universal Images Group
Date created:
May 27, 2018
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Universal Images Group Editorial
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941_04_bsip_015698_016.jpg
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