At the same time, it brings two potassium ions from the lumen to our cytoplasm of the epithelial cell of the proximal convoluted tubule. So this is an example of active transport. Not only does it utilize ATP, it also moves the sodium against its electrochemical gradient. 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.