Neurology. Chemical messenger substance serving for the transmission of electric impulses across a synapse. The neurotransmitter is released into the synaptic cleft from vesicles of the presynaptic neuron and causes a change in permeability and electric potential of the postsynaptic membrane, that may lead to the generation of a new action potential. Examples are acetylcholine, noradrenaline, adrenaline and serotonin.
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