The word "countercurrent" within "countercurrent multiplier" refers to the opposite direction of flow of
A) sodium and potassium across the wall of the nephron.
B) tubular fluid within the ascending and descending limb of the nephron loop.
C) salts and water across the wall of the renal tubule.
D) tubular fluid in the proximal convoluted tubule and collecting tubule.

Question

Quizplus · Accepted Answer

The term "countercurrent" in "countercurrent multiplier" refers to the opposite direction of flow of tubular fluid within the ascending and descending limbs of the nephron loop, which is essential for the concentration of urine.

The Word "Countercurrent" Within "Countercurrent Multiplier" Refers to the Opposite