Well, when the inside of the cell reaches a positive voltage of about positive 45 million volt at this point, this will signal our voltage gated sodium channels to close. And at the same time, it will signal the voltage gated potassium channels to actually open up. And at this point, this basically ends depolarization, and it starts repolarization. So once again, when the inside of the cell reaches our voltage of positive 45 millivolts, the voltage gated sodium channels will be shut, and they will be inactivated. And what that basically means, even if our sodium channels are actually open, what happens is a spherical protein attached to this channel basically moves in and closes our entrance. And even though it's open, the entrance is shut.