Answer
When a typical nerve is stimulated on its dendite,it causes the opening of sodium gates the allow Na + to go into the cell . This Na+ inflow neutralizes some of the internal negative charge . So the voltage across the membrane drifts towards zero .
Work Step by Step
When a membrane voltage shifts towards a less negative value it is called depolarization . The incoming Na+ diffuses for a short distance along the inside of the plasma membrane and produces a current that travels from the point of stimulation towards the triggerzone.