Now, the entire purpose of using this Atpas pump is to create an electrochemical gradient for sodium. So as a result of the action of this ATPase pump, we create a very high potassium, a very high sodium concentration on the lumen side of our cell. And what that does is it builds this concentration of sodium and allows the passive transport of sodium down its electrochemical gradient. So this protein membrane basically moves one of the sodium ions down its electrochemical gradient from a high to a low concentration. At the same time, it also moves an H ion from the cytoplasm to our lumen. So it secretes an H and it basically absorbs the sodium as a result of the concentration gradient created by this Atpas pump.