Question

what happens at the synapse between two neuron

Answer 1

at the synapse between two neuron when the impulse reaches the presynaptic terminal (the end of first neuron) of the first neuron it causes a number of neurotransmitters to be related into the synaptic cleft (the bit between the two neuron).

Answer 2

between synapse the electric impulse of signal travel from head of one neuron to tail of other neuron