What Is The Pineal Gland and the Endocrine System? | How The Human Body Works

The video introduces the pineal gland, a small endocrine gland in the brain, and its role in secreting melatonin, a hormone that regulates circadian rhythms. The pineal gland is shaped like a pine cone and is located in the midline of the brain. Melatonin secretion is highest at night, helping regulate sleep patterns. The suprachiasmatic nucleus in the brain receives signals from the retina and works with the pineal gland to control circadian rhythms. The video emphasizes the importance of the pineal gland in maintaining a healthy sleep-wake cycle.

What happens to melatonin levels as dawn approaches?

How does light influence the secretion of melatonin?