Tags: Protein.
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; in a human brain about 10000 to 20000 neurons in the hypothalamus.
