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  4. Which of the following is true for CO2 concentration?

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Q. Which of the following is true for $CO_2$ concentration?

Odisha JEEOdisha JEE 2004Breathing and Exchange of Gases

Solution:

Concentration or partial pressure of $CO_2\, (PCO_2)$ is $40 \,mm \,Hg$ in alveolar air and $32 \,mm \,Hg$ in expired air.