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Through a series of intricate pathways, capillaries and tunnels, the vasa recta help the kidney produce concentrated urine. The vasa recta contain a group of capillaries and vessels located in the kidneys. Biologically, the vasa recta lay parallel to the loop of Henle, which facilitates the flow of blood into and out of the kidneys. Keep Learning.
As well, blood in the vasa recta still has large proteins and ions which were not filtered through the glomerulus. This provides an oncotic pressure for ions to enter the vasa recta from the interstitium. The main function of the loop of Henle is to set up a concentration gradient.y means of a countercurrent multiplier system, which utilizes electrolyte pumps, the loop of Henle creates an area of high urea concentration deep in the medulla, near the papillary duct in the collecting duct system.