The pineal gland secretes ________, which is the hormone that maintains the body's internal clock, the 24-hour wake-sleep cycle, and regulates the onset and duration of sleep.

Question

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The hormone secreted by the pineal gland that regulates the body's internal clock and sleep-wake cycle is melatonin. Oxytocin is a hormone that plays a role in social bonding and childbirth, calcitonin regulates calcium levels in the blood, and cortisol is a stress hormone.

The Pineal Gland Secretes ________, Which Is the Hormone That