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The Endocrine System

The 24 / hour...

Question

The 24/hour (diurnal) rhythm of our body such as the sleep-wake cycle is regulated by the hormone

A

cacitonin

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B

prolactin

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C

adrenaline

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D

melatonin

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Solution

The correct option is D melatonin
Melatonin is a hormone made by the pineal gland. It helps our body know when it's time to sleep and wake up. Therefore, melatonin is the hormone which regulates the 24-hour (diural) rhythm of our body such as the sleep-wake cycle.

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