The most common site of origin for venous thrombi leading to pulmonary embolism is_____________?
Correct answer: C. Deep leg veins
- A. Ascending oaorta
- B. Portal vein
- C. Deep leg veins
- D. Right atrium
Explanation
Most pulmonary thromboemboli arise from deep venous thromboses in the legs, particularly the calf, femoral or iliac veins. A thrombus from the portal vein or left-sided vessels cannot ordinarily reach the pulmonary arteries.
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