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links motor neurons and muscles. Also facilitates learning and memory. Alzheimer's patients have an undersupply of this
concentrated in the brain, this is linked to muscle activity. A shortage can cause Parkinson's disease; an excess can cause schizophrenia
widely distributed in the CNS, it increases arousal. Too much may produce a manic state; too little may lead to depression
produced in the brain, it lowers activity level and causes sleep. Too little is linked to depression
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