But they open very slowly at first. At the same time, we also open the calcium voltage gated channels and calcium voltage gated channels are very slow to actually close. So basically what happens is because we have this additional voltage gated channel, and because the calcium ions go into the cell while the potassium goes out of the cell, and because the potassium has a larger charge, we see that the inner portion of the membrane stays positive for a longer period. And that means we have a longer depolarization period than normal than what we would see on a neuron. And this longer depolarization period is known as our plateau phase or plateau stage. So eventually the sodium channels or the calcium channels begin to close and our potassium channels begin to open quicker.