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A hormone responsible for normal sleep wake cycle isA. epinephrineB. gastrinC. melatonin.D. insulin.

Answer» Correct Answer - C
Melatonin is a hormone secreted by pineal gland. Immediately above the optic chiasma (in the brain) in a nuceus, are present melatonin receptors that react to this hormone and synchronise the nuclues to the 24 hrs day/night rhythm thus informing the brain when it is day and when it is right


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