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Define the term Pineal gland

What is Pineal gland?

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The pineal gland is also known as epiphysis or pineal body, is situated in center of the head. Hormone melatonin is secreted by pineal gland. It is a hormone produced at night and it is related to the regulation of the circadian rhythm (or circadian cycle or the wakefulness-sleep cycle). Melatonins possibly regulate numerous body functions related to the night-day alternation.

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