A chemical substance that is released at the end of a nerve fiber by the arrival of a nerve impulse and, by diffusing across the synapse or junction, causes the transfer of the impulse to another nerve fiber, a muscle fiber, or some other structure.
‘Cnidarians contain chemical synapses and release neurotransmitters, including biogenic amines and peptides.’
‘Excitatory neurotransmitters transfer an impulse to the next cell.’
‘Nerve impulses are transmitted at synapses by the release of chemicals called neurotransmitters.’
‘Postsynaptic proteins receive the neurotransmitters released by presynaptic proteins.’
‘A neuron generates an electrical impulse, causing the cell to release its neurotransmitters.’
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