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Human Body & Health

Which critical effect fails, related to fluid regulation, when ascending nephron loop damage disrupts the medullary gradient?

A)Decreased water reabsorption in the collecting duct
B)Increased sodium excretion by proximal tubule
C)Elevated creatine clearance at the glomerulus
D)Reduced potassium secretion by distal tubule

💡 Explanation

Reduced countercurrent multiplication impairs concentrated urine formation because the medullary osmotic gradient strength decreases; therefore, less water is reclaimed from the collecting duct, rather than altered sodium or potassium handling in other nephron segments under these specific loop failure conditions.

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