The Countercurrent Multiplier Is a System by Which the

Multiple Choice

The countercurrent multiplier is a system by which the

A) nephron loop multiplies the concentration of salts in the interstitial fluid of the kidney medulla.
B) nephron loop dilutes the concentration of solutes in the tubular fluid at its hairpin turn.
C) vasa recta secretes multiple amounts of metabolic wastes against their concentration gradient.
D) vasa recta becomes more concentrated with nitrogenous wastes than the urine.