part of part of vasa recta cell vasa recta descending limb cell It is known in some mammalian species that this cell may express the urea transporter B. https://cdn.humanatlas.io/digital-objects/2d-ftu/kidney-descending-thin-loop-of-henle/v1.1/assets/2d-ftu-kidney-descending-thin-loop-of-henle.png KUPO:0001071 https://cellxgene.cziscience.com/cellguide/CL_1001285 A cell that is part of some vasa recta descending limb. Vasa recta descending limb cells are specialized epithelial cells found in the vasa recta, a network of blood vessels in the renal medulla. These cells line the interior surface of the descending limb of the vasa recta and play a crucial role in the filtering and regulation of substances within the blood. In contrast to vasa recta ascending limb cells, the arterial-like epithelial cells of the descending vasa recta are non-fenestrated and covered by a pericyte layer that regulates the medullary blood flow. They help keeping the body’s fluid and electrolyte balance in check through a process known as countercurrent exchange system, in which the cells of the descending limb are permeable to water but relatively impermeable to solutes, such as sodium and urea. As the blood descends into the medulla along its descending limb, water passively diffuses out of the vasa recta, concentrating the blood in solutes. In addition to their central role in water and solute exchange, these cells contribute to maintaining the medullary osmotic gradient, a critical function to concentrate urine. The osmotic gradient is created by the counterflow of water and solutes between the descending and ascending limbs of the vasa recta and the adjacent Loop of Henle. The selective permeability of the descending limb cells allows them to maintain this gradient, which in turn helps to conserve water, a vital role in the overall function of the renal system. Thus, vasa recta descending limb cells have a significant function in renal physiology, particularly in osmoregulation and fluid balance. (This extended description was generated by ChatGPT and reviewed by the CellGuide team, who added references, and by the CL editors, who approved it for inclusion in CL. It may contain information that applies only to some subtypes and species, and so should not be considered definitional.) Homo sapiens descending vasa recta