Which is NOT true about the countercurrent multiplier system of the kidney?
A. It creates a hyperosmolar medullary interstitial fluid that allows the kidneys to form hypertonic urine.
B. The ascending loop of Henle is not permeable to water.
C. The fraction of filtered NaCl reabsorbed from the ascending limb equals the fraction of filtered water reabsorbed from the descending limb.
D. The descending loop of Henle is permeable to water.
E. There is active transport of sodium and chloride out of the ascending limb of the loop of Henle.
Answer: C
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