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ACh (Acetylcholine)

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


distributed throughout the CNS, these natural opiates relieve pain


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

GABA (gamma aminobutyric acid)

produced in the brain, it lowers arousal and reduces anxietey. It's the main inhibitory neurotransmitter in the nervous system

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