They essentially control the release of Renan and they also control the dilation of our a fairing arterial, thereby controlling the filtration rate within our glomerulus. Now, the other cells basically shown in brown are our epithelial cells and these are cuboidal epithelial cells. Now, the major difference between the epithelial cells in the distal convolute tubule and the epithelial cells in the proximal convolute is the following in the proximal convolute, our epithelial cells contain microvilli and this increases the reabsorption in the proximal convolute tubule. While in our distal convolute tubule, we don't have the microvilli on the tube oil epithelial cells. And that's exactly why reabsorption takes place at a much lower rate inside the distal convolute tubule than inside our proximal convolute tubule. In fact, most of the absorption in our nephron takes place within the distal convolute tubule and only about 5% of sodium and chloride is actually absorbed within the distal convolute tubule, as we'll see in just a moment.