If we multiply this by 1000, we get negative 87 millivolts. So we see that this would be our voltage difference, the electric potential difference between the inside and the outside portion of the resting membrane of the neuron. If the permeability of the membrane to sodium was zero, So we know that this is not actually the resting potential, the resting membrane potential, the voltage difference. Because our membrane is not only permeable to potassium, as we assumed here, but it's also permeable to sodium. So what will happen? Well, basically, as Our potassium is being pumped to the outside, the sodium will also begin to slowly pump to the inside.