An impulse travels along the axon of the pre-synaptic neuron until it reaches the dendrite at the end., The dendrite contains vesicles of chemical messengers called neurotransmitters., The impulse causes the release of these neurotransmitters into the synapse., The neurotransmitters diffuse across the synapse., Receptors on the post-synaptic cell membrane bind with the neurotransmitter., The binding opens sodium channels starting a new action potential.

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