The oxygenated blood enters the left atrium through:
Correct answer: B. Pulmonary veins
- A. Pulmonary artery
- B. Pulmonary veins
- C. Inferior vena cava
- D. Superior vena cava
Explanation
All veins carry deoxygenated blood except pulmonary veins, which carry blood from lungs to the left atrium.
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About Circulation
The circulatory system covers the chambers, valves and conducting pathway of the human heart, along with the cardiac cycle and control of heartbeat. It compares arteries, veins and capillaries by structure and function, and explains how the lymphatic system returns tissue fluid, transports absorbed fats and supports immunity.
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