Question

Which of the following is true for carbon dioxide concentration?

• A. It is more in alveolar air than in expired air
• B. It is more in expired air than in alveolar air
• C. It is more in inspired air than in alveolar air
• D. It is more in inspired air than in expired air

Answer 1

The correct option is A

It is more in alveolar air than in expired air

Concentration or partial pressure of $C{O}_2{(}_{p}C{O}_2)$ is 40 mm Hg in alveolar air and 32 mm Hg in expired air.