The pineal gland secretes ________, a hormone that helps to keep the biological clock in phase with the light-dark cycle.

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The pineal gland secretes melatonin, a hormone that helps regulate the sleep-wake cycle and keep the biological clock in phase with the light-dark cycle. Melatonin production is stimulated by darkness and inhibited by light, making it a key player in the body's circadian rhythm.

The Pineal Gland Secretes ________, a Hormone That Helps to Keep