alleryThe vasa recta arises from
AThe efferent arteriole of juxtamedullary nephrons
BThe afferent arteriole of cortical nephrons only
CThe renal vein at the medullary boundary
DThe collecting duct system in deep cortex
Answer & Solution
Correct answer: A. The efferent arteriole of juxtamedullary nephrons
Vasa recta = the long, hairpin capillaries arising from the EFFERENT arterioles of juxtamedullary nephrons.
They run alongside the long Henle loops and form the blood-side limb of the counter-current exchange.
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