<Li> Thin descending limb of loop of Henle </Li> <Dl> <Dd> The thin descending limb has low permeability to ions and urea, while being highly permeable to water . The loop has a sharp bend in the renal medulla going from descending to ascending thin limb . </Dd> </Dl> <Dd> The thin descending limb has low permeability to ions and urea, while being highly permeable to water . The loop has a sharp bend in the renal medulla going from descending to ascending thin limb . </Dd> <Ul> <Li> Thin ascending limb of loop of Henle </Li> </Ul>

As tubular fluid flows up the ascending loop of henle