Which Is NOT True About the Countercurrent Multiplier System of the Kidney

Multiple Choice

Which is NOT true about the countercurrent multiplier system of the kidney?

A) It creates a hyperosmolar medullary interstitium that allows the kidneys to form hypertonic urine.
B) The descending loop of Henle is permeable to water.
C) There is active transport of sodium and chloride out of the ascending limb of the loop of Henle.
D) The ascending loop of Henle is not permeable to water.
E) The fraction of filtered NaCl reabsorbed from the ascending limb equals the fraction of filtered water reabsorbed from the descending limb.