JBL EMT Practice Exam

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Deoxygenated blood from the abdomen, pelvis, and lower extremities is returned to the right atrium via the:

  1. common iliac vein

  2. coronary sinus vein

  3. inferior vena cava

  4. superior vena cava

The correct answer is: common iliac vein

The common iliac vein is the correct answer because it is responsible for draining deoxygenated blood from the abdomen, pelvis, and lower extremities and returning it to the right atrium. The coronary sinus vein and superior vena cava both drain oxygen-rich blood and do not carry deoxygenated blood. The inferior vena cava does carry deoxygenated blood, but it also receives blood from the abdominal organs and lower extremities, not just the abdomen, pelvis, and lower extremities as stated in the question.

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