Which of the following comparisons of osmolarity within the kidneys is INCORRECT?
A) The fluid in the proximal tubule is iso-osmotic with cortical interstitial fluid.
B) Osmolarity of the ascending limb of the loop of Henle is greater than that of the descending limb.
C) Osmolarity of the descending limb of the loop of Henle is iso-osmotic with the medullary interstitial fluid.
D) The osmolarity of plasma in the vasa recta varies with its location in the renal medulla.
E) Osmolarity of fluid in the proximal tubule is greater than the osmolarity of fluid in the end of the loop of Henle as it enters the distal tubule
Answer: B) Osmolarity of the ascending limb of the loop of Henle is greater than that of the descending limb.
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