Explain how an action potential is able to pass along a neuron

An action potential is able to pass along a nerve because of the depolarization occurring in one region of the axon which makes the next region more permeable to sodium ions. The transmission of a signal within a neuron is carried out by the opening and closing of the voltage-gated ion channels, which are as a result of a brief reversal of the resting membrane potential to create an action potential.