The Countercurrent Multiplier System

Multiple Choice

The countercurrent multiplier system

A) is found in the collecting duct.
B) is assisted by hormones.
C) has fluid flowing in parallel tubes in opposite directions.
D) maintains the solute concentration of the medullary interstitial fluid.
E) Both "has fluid flowing in parallel tubes in opposite directions" and "maintains the solute concentration of the medullary interstitial fluid" is correct.