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The Pineal Gland

A hormone res...

Question

A hormone responsible for normal sleep-wake cycle is?

A

Epinephrine

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B

Gastrin

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C

Melatonin

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D

Insulin

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Solution

The correct option is C Melatonin
Melatonin is a hormone secreted by pineal gland. Immediately above the optic chiasma(in the brain) in a nucleus, are present melatonin receptors that react to this hormone and synchronise the nucleus to the $24$ hrs day/night rhythm, thus informing the brain when it is day and when it is night.

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