Compared to atmospheric air, the alveolar air has

In the atmospheric air, p${\mathrm{O}}_2$ is 159 mm Hg and p${\mathrm{CO}}_2$ is 0.3 mm Hg. In the alveolar air, p${\mathrm{O}}_2$ is 104 mm Hg and p${\mathrm{CO}}_2$ is 40 mm Hg.