Indicate whether the portion of the tubule in question is permeable or impermeable to the substance in question using the following answer code:
-The vasa recta is ______ to salt and ______ to H₂O.

Question

Quizplus · Accepted Answer

The vasa recta is permeable to salt and impermeable to H₂O. This is because the vasa recta is a countercurrent multiplier system, which means that it uses the flow of blood in opposite directions to create a concentration gradient. The salt is concentrated in the medulla of the kidney, and the H₂O is concentrated in the cortex. The vasa recta is permeable to salt, so the salt can move from the medulla to the cortex. The vasa recta is impermeable to H₂O, so the H₂O cannot move from the cortex to the medulla. This creates a concentration gradient that allows the kidney to concentrate urine.

Indicate Whether the Portion of the Tubule in Question Is