So to see what we mean, let's take a look at the following diagram. So, as soon as the sodium channels begin to open up on the adjacent region, the sodium channels where the stimulus actually took place begin to close. And as they begin to close, that will basically inactivate our sodium channels and that will open up the potassium channels. And now potassium ions where the stimulus actually took place, the potassium channels will begin to open up and our potassium ions will begin to move down the electrochemical gradient from the inside of the cell to the outside of the cell. And this is known as our repolarization period. Now, we're going to once again change the polarity of the cell.