Depolarization

Depolarization:

 A process where an electrical charge of a neuron becomes less negative as the MEMBRANE potential moves from resting potential (70 mV) toward 0 mV; a decrease in voltage. The loss of membrane polarity is caused by the inside of the cell membrane
becoming less negative in comparison with the outside. Depolarization is caused by an influx of Na+ions through voltage-gated Na+ channels in axons.