The organization of the vasa recta around the loop of Henle allows:

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The vasa recta around the loop of Henle allows the concentration gradient established by the loop of Henle to be maintained. The vasa recta is a network of blood vessels that runs parallel to the loop of Henle, allowing for exchange of solutes and water between the blood and the renal medulla. This exchange helps to maintain the osmotic gradient established by the loop of Henle, which is necessary for the reabsorption of water by the collecting ducts. Urea is also important in the formation of the concentration gradient, but the vasa recta does not specifically allow for its concentration in the distal convoluted tubule. Similarly, the vasa recta does not specifically allow for maximal reabsorption of water from the distal convoluted tubule.

The Organization of the Vasa Recta Around the Loop of Henle