And what this protein pump does is it establishes an electrochemical gradient in which we have a higher concentration of sodium on the lumen side than inside our cell. Now, why is this important? Well, it's important because it allows the function of other proteins found within our cells, as we'll see in just a moment. So let's move on to the second type of protein known as the potassium, the sodium chloride cotransport, a protein. This is this protein here. So this protein actually functions as a result of the Atpas pump, because the Atpas pump is able to establish this electrochemical gradient in which we have more sodium.