Orexin, also called hypocretin, is a neurotransmitter that regulates arousal, wakefulness, and appetite. The most common form of narcolepsy, in which the sufferer briefly loses muscle tone (cataplexy), is caused by a lack of orexin in the brain due to destruction of the cells that produce it. The brain contains very few cells that produce orexin; ...
Found on
http://en.wikipedia.org/wiki/Orexin
(ORX) Type: Term Pronunciation: ō-rek′sin Definitions: 1. Neuropeptide involved in neuroendocrine function including feeding and drinking behavior; two subtypes, A and B, exist.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=63187
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