And this process is known as depolarization. Now, when we reach the positive 45 millivolt value, the sodium channels will close, they will become inactivated while the potassium channels will begin to open. And now no longer will the sodium move outside, but the potassium no longer will the sodium move inside, but the potassium will begin to move outside. At this point, the inside will become negative again. And so this will decrease as shown by this curve. So this is known as the repolarization period.