Q.Name the hormone secreted by the pineal gland that helps regulate the body's sleep-wake (circadian) rhythm.

[!TLDR]

Melatonin, from the pineal gland, regulates the sleep-wake (circad …

Melatonin is the principal hormone secreted by the pineal gland. Its secretion rises during darkness and falls during daylight, driven by a dedicated retinal light-sensing pathway, and this daily rhythm acts as the body's chief internal timing cue, entrain …

Recall the pineal gland's single major hormone and its principal role in circadian …

Confusing melatonin (pineal gland, circadian rhythm) with any of the pituitary or hypothalamic hormones -- the pineal gland is an …