BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Blood levels of the pineal hormone melatonin are high at night and low during the day. Its secretion is regulated by a rhythm-generating system located in the suprachiasmatic nucleus of the hypothalamus, which is in turn regulated by light.

Detailed explanation-2: -But when darkness comes at night, the SCN sends messages to the pineal gland. This gland triggers the release of the chemical melatonin. Melatonin makes you feel sleepy and ready for bed.

Detailed explanation-3: -Melatonin is a hormone that your pineal gland, part of your circadian clock in the brain, naturally produces and releases throughout the night. Evening peaks and morning drops in melatonin play a role in regulating sleep-wake cycles.

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.

Detailed explanation-5: -Melatonin is produced from serotonin (made from tryptophan), through a cascade of enzymatic reactions (Figure 1).