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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Urea movement from the collecting duct to the medullary interstitial fluid helps maintain the medullary concentration gradient by increasing the osmolarity of the medullary interstitial fluid, which is crucial for the kidney's ability to concentrate urine.

Which of the Following Would Help Maintain the Medullary Concentration