The oxygen tension of the mixed venous blood is______________?
Correct answer: A. 40 mm Hg
- A. 40 mm Hg
- B. 25 mm Hg
- C. 55 mm Hg
- D. 70 mm Hg
Explanation
Mixed venous blood has returned from the tissues after oxygen extraction, so its PO2 falls from the arterial value of about 95–100 mm Hg to approximately 40 mm Hg. This value represents blood entering the pulmonary circulation.
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