Where do we find the steepest osmotic pressure gradient between the lumen of collecting duct (i.e. the urine in it) and the surrounding renal tissue? Select one: At the border between renal cortex and medulla. In the middle region of the medulla. Deep in the medulla. Superficial in the medulla. In the renal cortex. In the adrenal glands.
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Osmotic pressure is the pressure exerted by a solvent (in this case, urine) to prevent the movement of water across a semipermeable membrane (in this case, the walls of the collecting duct). Show more…
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The high osmolarity of the renal medulla is maintained by all of the following except \begin{equation}\begin{array}{l}{\text { (A) active transport of salt from the upper region of the }} \\ {\text { ascending limb. }} \\ {\text { (B) the spatial arrangement of juxtamedullary nephrons. }} \\ {\text { (C) diffusion of urea from the collecting duct. }} \\ {\text { (D) diffusion of salt from the descending limb of the loop }} \\ {\text { of Henle. }}\end{array}\end{equation}
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