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

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The pineal body secretes melatonin, which regulates the body's internal clock, the 24-hour wake-sleep cycle, and the onset and duration of sleep. Oxytocin is a hormone involved in labor and lactation, calcitonin regulates calcium levels in the blood, and cortisol is a stress hormone.

The Pineal Body Secretes Which Hormone That Maintains the Body's