What structure supplies blood to the medulla?
a. Renal artery
b. Arcuate artery
c. Peritubular capillary
d. Vasa recta
ANS: D
The vasa recta is a network of capillaries that forms loops and closely follows the loops of Henle and is the only blood supply to the medulla. This need is not met by the renal arteries, the arcuate arteries, or the peritubular capillaries.
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