Which of the following sentences about vasa recta is correct?
- AIt is a part of the renal tubule.
- BIt is a U-shaped vessel running parallel to loop of Henle deep into the medulla in most of the nephrons.
- CIt originates from the afferent arteriole.
- DDuring the counter-current mechanism, NaCl is transported back to the interstitium by the ascending portion of vasa recta.
✓ Correct answer: D
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