Which of the following blood vessels carries oxygen-rich blood directly from the lungs into the left atrium of the human heart?
Answer and explanation
Correct answer: A. Pulmonary veins
- Step 1: Trace pulmonary circulation: Deoxygenated blood is pumped from the right ventricle into the pulmonary trunk and arteries.
- Step 2: In the alveolar capillaries, blood releases carbon dioxide and binds oxygen.
- Step 3: Four pulmonary veins return this freshly oxygenated blood from the lungs into the left atrium of the heart.
- Step 4: Identify the vessel as pulmonary veins.
Answer
Pulmonary veins.
Why not the others: 'Pulmonary artery' carries deoxygenated blood away from the right ventricle to the lungs; 'Superior vena cava' returns deoxygenated systemic venous blood from the upper body into the right atrium; 'Aorta' delivers oxygenated blood from the left ventricle to the systemic circulation.
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