Depolarisation of the cell membrane involves: A. sodium channels opening to allow Na + to fl ow in. B. potassium channels opening to allow K + to fl ow in. C. chloride pumps quickly pumping large amounts of Cl − outside. D. electrical attraction between K + inside and Cl − outside.
Option A. The influx of positive Na ions modifications the polarisation of the cell from negative inside to positive inside at that place at the membrane. This reversal is referred to as depolarisation.
