The two currents move in opposite direction. Now, multiplier means the loop of Henley multiplies the amount of water. It increases the amount of water that is passively absorbed back into our body from the loop of Henley, as well as from other parts of our nephron, such as the collecting duct. Now, to fully understand what the system is and how the loop of Henley actually creates this concentration gradient between the surrounding tissue and the lumen of our loop of Henley, let's begin with our thick ascending loop of Henley. So we're essentially going to work backwards. Now, as I mentioned earlier, the thick ascending loop of Henley contains epithelial cells that are relatively thick, relatively large.