Action Potential, Travels along the axon and invades the pre synaptic neuron, Action potential triggers the opening of calcium channels open and calcium ions enter the pre synaptic neuron., Calcium ions trigger the vesicles to move towards the synapse, The vesicles release the neurotransmitters into the synapse, The neurotransmitters travel across the synapse, Neurotransmitters bind to receptors from the post synaptic neuron., Once bound sodium ions open, allowing chemical messengers to be passed on., Action potential has successfully taken place and the signal has passed from the pre to the post synaptic neuron, Unused neurotransmitters are released by the receptors; they are broken down in the synaptic cleft by enzymes and taken back by the pre synaptic neuron..

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