The PCO₂ in alveolar air is _____ blood.
A) less than in the systemic venous
B) greater than in the systemic venous
C) equal to the systemic arterial
D) Both A and C are correct.

Question

Quizplus · Accepted Answer

The PCO₂ in alveolar air is less than in the systemic venous blood because CO₂ is being exhaled, but it is equal to the systemic arterial blood, as the arterial blood reflects the gas exchange that has occurred in the lungs.

The PCO₂ in Alveolar Air Is _____ Blood