The pineal gland is rich in serotonin, a substance secreted by the nervous system. Recently a new hormone, melatonin, and an enzyme found only in the pineal were isolated. Research showed that the enzyme acted on serotonin to form melatonin, Mela¬tonin acts on the sex glands to inhibit (stop) the sexual cycle.
Light controls the amount of hormone produced through the sympathetic nervous system. The concentration of melatonin shows a 24-hour rhythm, decreasing during the day and increasing at night.
Pineal gland
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