Transmission of nerve impulse through synapse

• Axon or neuron where impulse is initiated is presynaptic neuron and neurons which receive, it is called post synaptic neuron or dendrites.
• Presynaptic neuron contains many synaptic vesicles which are filled with neurotransmitter like adrenaline or acetylcholine.
• Post synaptic membrane of next neuron contains receptors which are sensitive to neurotransmitter.
• Space present between two neurons is called synaptic cleft.
• When an action potential excites presynaptic neuron, vesicle burst and release neurotransmitter to synaptic cleft.
• Post synaptic membrane (Receptor) receives neurotransmitter which causes depolarization of neuron.
• To prevent continued depolarization, neurotransmitter get diffused or uptake by presynaptic neuron for its reuse.
• This is unidirectional movement of nerve impulse.