GENERAL HISTOLOGY

Detailed explanation-1: -Melatonin is the only known hormone synthesized by the pineal gland and is released in response to darkness hence the name, “hormone of darkness” [10]. Melatonin provides a circadian and seasonal signal to the organisms in vertebrates.

Detailed explanation-2: -The pineal gland secretes melatonin, which is a hormone that helps regulate circadian rhythms. Melatonin is produced according to the amount of light a person is exposed to. The pineal gland releases greater amounts of melatonin when it is dark, which points to melatonin’s role in sleep.

Detailed explanation-3: -Melatonin plays several key roles, and can be considered the central “relayer” which conveys information about light–dark cycles. In mammals, melatonin is also essential in the regulation of reproductive behaviour and sleep.

Detailed explanation-4: -Melatonin is a natural hormone that’s mainly produced by your pineal gland in your brain. It plays a role in managing your sleep-wake cycle and circadian rhythm. Scientists still have a lot to learn about all of its effects on the human body.