If the membrane potential is equal to the equilibrium potential for an ion, individual ions will NOT move across the membrane in either direction.

Question

Quizplus · Accepted Answer

Even if the membrane potential is equal to the equilibrium potential for an ion, individual ions can still move across the membrane in both directions due to random thermal motion; however, the net movement (or net flux) of the ion across the membrane will be zero, as the movements in one direction will be balanced by movements in the opposite direction.

If the Membrane Potential Is Equal to the Equilibrium Potential