But now our potassium channels begin to open up, and we have a movement of potassium to the outside. And so what that basically means is, because we have a movement of the potassium onto the outside, initially the movement of potassium to the outside is higher than the movement of calcium to the inside. And so we have this decrease in our membrane potential. It becomes more negative, slightly more negative. That is shown by phase one. So the movement of the positively charged ions out of the cell down their electrochemical gradient from a high concentration to a low concentration that causes the inside of the cell to basically become more negative.