Which of the following statements is true?
A. Only sodium diffuses from the descending limb.
B. Solutes are actively transported from the ascending limb.
C. Na+ and Cl- ions are actively transported into the vasa recta.
D. The osmolality of the descending limb decreases as filtrate moves through.
E. Water moves by osmosis out of the ascending loop.
Answer: B. Solutes are actively transported from the ascending limb.