And phase number three is this phase. This is known as our repolarization phase. This is when our calcium voltage gated channels essentially close, and that causes the opening of even more potassium voltage gated channels, and that creates a very high efflux of our potassium to the outside. So our potassium rushes to the outside, and that causes the inside of the cell to basically become more negative, and eventually it returns to the resting membrane potential. So as the calcium voltage gated channels begin to close, the influx of potassium exceeds the influx of calcium. So the movement of potassium to the outside exceeds the movement of calcium to the inside, and that basically causes the opening of even more of these voltage gated potassium channels shown in green.