ANATOMY

Detailed explanation-1: -The main function of the pineal gland is to receive information about the state of the light-dark cycle from the environment and convey this information by the production and secretion of the hormone melatonin.

Detailed explanation-2: -It’s a part of your endocrine system and secretes the hormone melatonin. Your pineal gland’s main job is to help control the circadian cycle of sleep and wakefulness by secreting melatonin.

Detailed explanation-3: -Melatonin: a hormone used for sleep problems-NHS.

Detailed explanation-4: -The precursor to melatonin is serotonin, a neurotransmitter that itself is derived from the amino acid tryptophan. Within the pineal gland, serotonin is acetylated and then methylated to yield melatonin. Synthesis and secretion of melatonin is dramatically affected by light exposure to the eyes.