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.

Question

Quizplus · Accepted Answer

The countercurrent multiplier system involves fluid flowing in parallel tubes (the loop of Henle) in opposite directions, which helps to maintain the solute concentration gradient in the medullary interstitial fluid, crucial for the kidney's ability to concentrate urine.

The Countercurrent Multiplier System