The new pulmonary math. Applying the a/A ratio.
D002245:Carbon Dioxide / Q000097:blood; D003422:Critical Care; D006801:Humans; D008433:Mathematics; D010100:Oxygen / Q000097:blood; D010313:Partial Pressure; D011650:Pulmonary Alveoli / Q000098:blood supply; D014692:Ventilation-Perfusion Ratio
D002245:Carbon Dioxide; D010100:Oxygen