Which of the Following Would Help Maintain the Medullary Concentration

question 140

Multiple Choice

Which of the following would help maintain the medullary concentration gradient?

• A) Movement of urea from the distal convoluted tubule to the proximal convoluted tubule
• B) Urea movement from the collecting duct to medullary interstitial fluid
• 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) Urea movement into the collecting duct

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