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melatonin |
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melatonin: see pineal gland pineal gland (pĭn`eəl), small organ (about the size of a pea) situated in the brain . ..... Click the link for more information. . melatoninHormone secreted by the pineal gland of most vertebrates. It appears to be important in regulating sleeping cycles; more is produced at night, and test subjects injected with it become sleepy. Melatonin may be involved in seasonal affective disorder. In mammals other than humans, melatonin may act as a cue to breeding and mating in season. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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