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What is melatonin? What is its role in human physiology?

Answer 1

Melatonin is the hormone which makes the body sleep.

A key factor in how human sleep is regulated is exposure to light or to darkness. The exposure of the human eye to light makes movement in a nerve from the retina to the suprachiasmatic nucleus (SCN).
From here the instructions are given to others parts of the brain which control the hormonal release.

Pineal gland-
When you have sleep disorders you are given Melatonin supplements to sleep properly.
Overdose of the drug can even take the human body to coma.

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Answer 2

Sophia Atencio

The pineal gland in the brain produces a hormone called melatonin, which is important in controlling the circadian rhythm, or sleep-wake cycle. Melatonin signals to the body when it's time to go to sleep; levels usually rise in the evening in response to darkness, promoting sleepiness, and fall in the morning in response to light, promoting wakefulness. Melatonin also has antioxidant properties and is involved in other physiological processes, such as immune function and hormone regulation.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.