title: Countercurrent exchange in the inner renal medulla: vasa recta- descending limb system.
mesh_terms: D001692:Biological Transport; D007668:Kidney / Q000378:metabolism*; D007679:Kidney Medulla / Q000378:metabolism; D007700:Kinetics; D008138:Loop of Henle / Q000378:metabolism; D008433:Mathematics; D008954:Models, Biological; D014508:Urea / Q000378:metabolism; D014882:Water-Electrolyte Balance
chemical_list: D014508:Urea