Question

Which of the following is true for $C{O}_2$ concentration?

• A. More in alveolar air than in expired air
• B. More in expired air than in alveolar air
• C. More in inspired air than in alveolar air
• D. More in inspired air than in expired air

Answer 1

Answer: (A)

Concentration or partial pressure of $C{O}_2(PC{O}_2)$ is $40mmHg$ in alveolar air and $32mmHg$ in expired air.