So the question is, so we know that absorption and secretion takes place within the distal convolute tubule, but what exactly is absorbed and what exactly is secreted and how do these processes take place? So they occur as a result of the different types of protein transporters that are found on the membrane of these epithelial cells. So let's discuss these different types of protein transporters found along our membrane of the cuboidal epithelial cells found in the distal convolute tubule. The first type of protein transport that we have to discuss is called NA K, sodium, potassium, Atpace pump. And this is a pump, meaning it actually uses active transport. It utilizes an ATP molecule to establish an electrochemical gradient.