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In a chemical synapse, when an impulse arrives at the axon terminal, it:
1. leads to opening of the calcium channels at the post synaptic membrane
2. Stimulates the movement of synpatic vesicles towards the membrane 
3. causes the binding of the neurotransmitter of its receptors on the post synaptic neuron 
4. activates the opening the potassium channels in the axon terminal