Q. What do you mean by synapses?

Synapses are the structures that transmit the neural impulse between two neurons.

When the electric impulse arrives the presynaptic membrane of the axon releases neurotransmitters that bind to postsynaptic receptors of the dendrites of the next cell the activated state of these receptors alters the permeability of the electric depolarization and the dendritic membrane propagates along the neuron plasma membrane to its axon.