Which of the following is a part of the pulmonary circuit?
Correct Answer:
Pulmonary vein
Rationale:
The pulmonary circuit carries blood between the heart and the lungs. The pulmonary vein is responsible for carrying oxygenated blood from the lungs to the left atrium of the heart — a key component of the pulmonary circulation.
In contrast, the aorta is part of the systemic circuit, the superior vena cava returns deoxygenated blood from the body to the right atrium, and the bronchial artery supplies blood to lung tissue, not part of the pulmonary circuit.