_______________, a hormone secreted by the pineal gland, helps to keep the biological clock in phase with the light-dark cycle.

Question

Quizplus · Accepted Answer

Melatonin is a hormone secreted by the pineal gland that helps to keep the biological clock in phase with the light-dark cycle. It is responsible for regulating sleep-wake cycles and is often used as a sleep aid. The production of melatonin is stimulated by darkness and inhibited by light.

_______________, a Hormone Secreted by the Pineal Gland, Helps to Keep