First slide
Human Endocrine System
Question

The hormone that plays a very important role in maintaining sleep-wake cycle is

Easy
Solution

The pineal gland secretes a hormone called melatonin. It helps in maintaining the normal rhythms of sleep-wake cycle and body temperature. The production of melatonin is influenced by light. The concentration of melatonin raises from the twilight, attains peak during midnight and lowers by early morning. 

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