- Types:
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Adrenalin, adrenaline, epinephrin, epinephrine
a catecholamine secreted by the adrenal medulla in response to stress (trade name Adrenalin); stimulates autonomic nerve action
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GABA, gamma aminobutyric acid
an amino acid that is found in the central nervous system; acts as an inhibitory neurotransmitter
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acetylcholine
a neurotransmitter that is a derivative of choline; released at the ends of nerve fibers in the somatic and parasympathetic nervous systems
