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colleen colleen
wrote...
Valued Member
Posts: 17077
11 years ago
What evidence is there that circadian rhythms are controlled by a biological clock?  What brain structure
and hormone are involved?
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wrote...
Valued Member
11 years ago
Circadian rhythms continue to occur in the absence of any external time cues.
The biological clock is the suprachiasmatic nucleus located in the hypothalamus.
The hormone melatonin is secreted by the pineal gland during darkness.
Melatonin appears to help keep the biological clock synchronized with external daylight.
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