What is the percentage of oxygen in expired a | vedclass

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(B) The composition of atmospheric air (inspired air) is approximately $21\%$ oxygen,$0.04\%$ carbon dioxide,and $78\%$ nitrogen.During the process of

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$16$

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(B) The composition of atmospheric air (inspired air) is approximately $21\%$ oxygen,$0.04\%$ carbon dioxide,and $78\%$ nitrogen.During the process of respiration,oxygen is consumed by the body cells for cellular respiration,and carbon dioxide is produced as a byproduct.Expired air (exhaled air) contains approximately $16\%$ oxygen,$4\%$ carbon dioxide,and $79\%$ nitrogen.Therefore,the correct percentage of oxygen in expired air is $16\%$.

What is the percentage of oxygen in expired air (in $\%$)?

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