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AP Psych C. 2 Neurotransmitters

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ACh (Acetylcholine)
links motor neurons and muscles. Also facilitates learning and memory. Alzheimer's patients have an undersupply of this
dopamine
concentrated in the brain, this is linked to muscle activity. A shortage can cause Parkinson's disease; an excess can cause schizophrenia
endorphins
distributed throughout the CNS, these natural opiates relieve pain
norepinephrine
widely distributed in the CNS, it increases arousal. Too much may produce a manic state; too little may lead to depression
serotonin
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