An influx of Na⁺ ions depolarizes the membrane of an axon.

Name: An influx of Na⁺ ions depolarizes the membrane of an axon.
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An influx of Na⁺ ions depolarizes the membrane of an axon by making the inside of the axon more positive relative to the outside. This is due to the fact that Na⁺ ions have a positive charge and their influx into the cell contributes to a positive charge inside the cell. This depolarization initiates an action potential that travels down the axon.

An Influx of Na⁺ Ions Depolarizes the Membrane of an Axon