At any membrane potential other than the ex, there will be an electrochemical driving force for the movement of X+ across the membrane, which tend to pull the membrane potential toward its Ex The greater the difference between the membrane potential and the Ex will result in a greater driving force for net movement of ions Movement can only happen if there are open channels• At any membrane potential other than the Ex , there will be an electrochemical driving force for the movement of X+ across the membrane, which tend to pull the membrane potential toward its EX . • The greater the difference between the membrane potential and the EX will result in a greater driving force for net movement of ions. • Movement can only happen if there are open channels!