The Countercurrent Multiplier System of the Kidney

Multiple Choice

The countercurrent multiplier system of the kidney

A) Allows the kidneys to form hypertonic urine
B) Requires that the collecting ducts be near the loops of Henle
C) Requires active transport of sodium and chloride out of the ascending limb of the loop of Henle
D) Would not function if the ascending limb of the loop of Henle were freely permeable to water
E) Is described by all of these choices