The synapse: the junction or relay point between two neurons or between a neuron and an effectorsSynaptic cleft: NeurotransmitterNeuron communication:An action potential arrives the synaptic knobAction potential make the fusion of vesicle with plasma membraneThe fused vesicle releases NTs into cleftNTs diffuse cross the cleft and bind with receptor on the receiving cell’s membraneOpening the chemically-gated ion channels in receiving cellsThe NTs is broken down by enzyme and the ion channel closed