Secretion of ________ from the pineal gland peaks at night and declines during the day.

Question

Quizplus · Accepted Answer

The secretion mentioned in the question is melatonin, which is produced by the pineal gland and is known to regulate the sleep cycle. Its secretion peaks at night, making it easier to fall asleep, and declines during the day. The other choices, melanin, carbon dioxide, and glucose, are not produced by the pineal gland nor do they show such diurnal variation in secretion.

Secretion of ________ from the Pineal Gland Peaks at Night