Melatonin, also known as chemically N-acetyl 5-methoxytryptamine is a naturally occurring compound found in animals, plants and microbes. In animals, circulating levels of the hormone melatonin vary in a daily cycle, thereby allowing the entraiment of the circadian rythms of several biological functions.
The 24 hour (diurnal) rhythm of our body such as the sleep-wake cycle is regulated by the hormone
NEET UG 2011 — Zoology Chemical Coordination and Integration
The 24 hour (diurnal) rhythm of our body such as the sleep-wake cycle is regulated by the hormone
Held on 30 Apr 2011 · Verified 9 Jul 2026.
Options
- A
calcitonin
- B
prolactin
- C
adrenaline
- D
melatonin
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