alleryStart learning →Why does the nephron's blood supply qualify as a portal system?
AIts veins drain straight to the liver
BOne capillary bed feeds a second through a vessel
CIt contains no arterioles at any point
DIt bypasses the heart circulation entirely
Answer & Solution
Correct answer: B. One capillary bed feeds a second through a vessel
1. A portal system is defined by two capillary beds in series.
2. Here the glomerulus drains into a vessel that in turn forms the peritubular capillaries and vasa recta.
3. It is the only portal system with an arteriole between the two beds.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 25 "The Urinary System", section Nephrons and Vessels_
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