Which of the following would help maintain the medullary concentration gradient?
A. Urea movement from the collecting duct to medullary interstitial fluid
B. Urea movement into the collecting duct
C. Movement of water from the ascending limb into the medullary interstitial fluid
D. Active transport of Na+ and Cl? from the medullary interstitial fluid into the collecting duct
E. Movement of urea from the distal convoluted tubule to the proximal convoluted tubule
Answer: A
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