The ratio of oxygen in export if respiratory______________________?
Correct answer: D. 16%
- A. 15%
- B. 21%
- C. 12%
- D. 16%
Explanation
Expired air contains approximately 16% oxygen because some oxygen has been absorbed by the blood and used by body cells. Inspired air contains about 21% oxygen, making 16% the appropriate value for exhaled air.
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