The main product of the pineal gland is _____, which helps to control the sleep-wake cycle (and is sold in health food stores to alleviate 'jet lag').

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Anatomy refers to the internal and external structures of the body and their physical relationships, whereas physiology refers to the study of the functions of those structures.


1. The main product of the pineal gland is _____, which helps to control the sleep-wake cycle (and is sold in health food stores to alleviate 'jet lag').