title: The concentrating mechanism in the renal medulla.
mesh_terms: D001693:Biological Transport, Active; D002463:Cell Membrane Permeability; D005110:Extracellular Space / Q000378:metabolism; D007668:Kidney / Q000502:physiology*; D007671:Kidney Concentrating Ability; D007679:Kidney Medulla / Q000378:metabolism / Q000502:physiology*; D007684:Kidney Tubules / Q000502:physiology; D008138:Loop of Henle / Q000502:physiology; D009994:Osmolar Concentration; D012965:Sodium Chloride / Q000378:metabolism; D014508:Urea / Q000378:metabolism; D014882:Water-Electrolyte Balance
chemical_list: D012965:Sodium Chloride; D014508:Urea