Where is the concentration of oxygen in the blood highest?

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Multiple Choice

Where is the concentration of oxygen in the blood highest?

Explanation:
Oxygen concentration is highest after blood has been oxygenated in the lungs. Freshly oxygenated blood returns from the lungs through the pulmonary veins into the left atrium, so the blood in the pulmonary veins is the most oxygen-rich in the circulation. The pulmonary artery carries blood to the lungs and is relatively low in oxygen until it picks up oxygen; the superior vena cava brings in deoxygenated blood from the body into the right atrium. Hence, the pulmonary veins carry the highest oxygen content.

Oxygen concentration is highest after blood has been oxygenated in the lungs. Freshly oxygenated blood returns from the lungs through the pulmonary veins into the left atrium, so the blood in the pulmonary veins is the most oxygen-rich in the circulation. The pulmonary artery carries blood to the lungs and is relatively low in oxygen until it picks up oxygen; the superior vena cava brings in deoxygenated blood from the body into the right atrium. Hence, the pulmonary veins carry the highest oxygen content.

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