So let's take a look at the following diagram which summarizes what takes place within the thick ascending loop of Henley. So what it does is it uses ATP to establish an electrochemical gradient that allows the movement of sodium, potassium and chloride from the lumen, from the lumen of aristic ascending lupifamily into the cells, and eventually out of the basil lateral side and into the interstituum of our loop of Henley into the surrounding tissue. And this concentrates increases the solute concentration found in the interstituent. In fact, as we go down along the medulla, we have an increasing concentration of the solute of the sodium and chloride as we go lower and lower. And we'll see why that's important in just a moment. Now, between our cells, we have Thai junctions.