Na+ ions are drawn to the negatively charged interior of the cell because its Na+ concentration is significantly higher outside than within.
Action potentials rely heavily on voltage-gated sodium channels. A small but significant quantity of Na+ ions will enter the cell down their electrochemical gradient if enough channels open when the membrane potential of the cell changes, further depolarizing the cell.
The neuron membrane contains voltage-gated Na+ channels that allow access to the cell. Ions rush into the cell, propelled by both the chemical and electrical gradients, because the concentration of Na+ is 10 times higher outside the cell than it is inside.
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