A chemical substance, such as acetylcholine and amino acid transmitters, which opens channels through which ions (electrically charged particles such as sodium, Na+ and potassium, K+, ions) can flow in a post-synaptic membrane causing a change in the post-synaptic membrane potential. Compare metabotropic neurotransmitter.
ionotropic neurotransmitter
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 | glutamic acid |
| glycine |
| gamma-aminobutyric acid |
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