More than 50 neurotransmitters have been identified. Important examples include adrenaline and noradrenaline (in adrenergic nerves) and acetylcholine (in cholinergic nerves).
The neurotransmitter is released at the synaptic knob at the tip of an axon into the synaptic cleft. It diffuses across to the opposite membrane (the postsynaptic membrane), where it triggers the propagation of a nerve impulse in the next neuron.
Related category• ANATOMY AND PHYSIOLOGY
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