Which blood vessel carries oxygenated blood from the lungs directly into the left atrium of the human heart?
Answer and explanation
Correct answer: C. Pulmonary vein
- Step 1: In the circulatory system, veins carry blood toward the heart.
- Step 2: The pulmonary veins are unique among veins because they transport freshly oxygenated blood from the pulmonary alveolar capillaries into the left atrium.
Answer
Pulmonary vein.
Why not the others: 'Pulmonary artery' carries deoxygenated blood from the right ventricle to the lungs; 'Superior vena cava' returns deoxygenated blood from the upper body to the right atrium; 'Aorta' distributes oxygenated blood from the left ventricle to systemic circulation.
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