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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