So this is an ATPase. It basically uses one ATP molecule and transforms that into an ATP. At the same time, it pumps three sodium ions basically against its electrochemical gradient and into the lumen of the proximal convolute tubule. 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.