Now, as a result of the action of these ligand gated ion channels, there might be a change in the membrane voltage as we'll discuss in a future election. So this might become less positive or less negative. Let's say it decreases or it increases to about negative 40 millivolts. Now, when this change takes place, as a result of that change in the membrane voltage, the electric potential difference between the two sides of the cell, what happens is this opens up. And once it opens up, it allows the movement of the sodium ions down their electrochemical gradient. From this from the outside to this side, to the inside.