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. And so our sodium ions cannot actually move out or in to our cell. So at the same time, this membrane voltage will signal the voltage gated potassium channels to actually open up and become active. And now these potassium ions will basically move down their electrochemical gradient.