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The partial pressure of oxygen and carbon dioxide in blood of superior vena cava are respectively
Solution:
The superior vena cava carries deoxygenated blood from the upper body to the right atrium of the heart. This blood is rich in carbon dioxide and poor in oxygen, having exchanged gases with the body tissues. The typical partial pressure of oxygen (pO2) in deoxygenated blood (venous blood) is about 40 mmHg, and the partial pressure of carbon dioxide (pCO2) is about 45 mmHg. Therefore, option (2) is correct.