How do synapses work?

The nerve impulse reaches the end of the axon. neurotransmitters leave the presynaptic cell through exocytosis and diffuse through the synaptic cleft. they bind to neurotransmitter receptors in the postsynaptic cell, which immediately allows sodium to diffuse in. This creates an action potential. The leftover neurotransmitters are broken down in the synaptic cleft and taken in by vesicles into presynaptic cell