Melatonin is secreted by the . . . . . . .

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(A) The pineal gland is a small,pinecone-shaped endocrine gland located in the epithalamus,near the center of the brain.It secretes the hormone melato

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Pineal gland

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(A) The pineal gland is a small,pinecone-shaped endocrine gland located in the epithalamus,near the center of the brain.It secretes the hormone melatonin,which plays a crucial role in regulating the circadian rhythm (the body's internal $24$-hour sleep-wake cycle).Melatonin production is stimulated by darkness and inhibited by light,helping the body prepare for sleep.

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