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Renal portal system of frog carries blood from
ALower body parts directly to the kidneys
BThe kidneys back to the right atrium
CThe intestine directly to the gall bladder
DThe lungs back to the buccal cavity
Answer & Solution
Correct answer: A. Lower body parts directly to the kidneys
Renal portal system: venous blood from the lower body (hindlimbs, posterior trunk) is delivered to the kidneys via renal portal veins. Mammals have lost this system; in frogs it allows the kidney to filter even unoxygenated peripheral blood.
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