What is the effect of the movement of Na + into a nerve cell followed very soon by the movement of K + out of the nerve cell? A. this establishes the resting membrane potential B. these movements are known as depolarisation and repolarisation C. these movements repolarise the cell D. it changes the membrane potential from about −70 mV to about −50 mV
Option B. When Na ++ moves right into a nerve cell the cell depolarises (from −70 mV to about 30 mV) when quickly afterwards K + movements out of the nerve cell, it repolarises (from 30 mV again to −70 mV).
