So, because we have a high concentration of potassium inside, and because we have a negative charge on the outside, these positively charged potassium ions will move down their electrochemical gradient and to the outside of our cell. Now, the reason we call it repolarization period is because this period basically attempts to return our membrane potential back to its resting potential. And that's because the positive charge begins to decrease on the inside as the positively charged potassium leave the inside and travel to the outside. So as soon as the voltage gated potassium channels open, the potassium ions will move down the electrochemical gradient to the outside of the cell, to this region here. Now, the membrane will once again become more permeable to our potassium than to sodium. And the sodium basically rushes out of the cell and this will make the inside more negative and the outside more positive.