Q.What is pulmonary diffusion? How does it respond to training?

Pulmonary diffusion is how oxygen and carbon dioxide actually cross between air and blood inside the lungs, and training makes this exchange more effective. …

Section 7.3.2 defines pulmonary diffusion as "the capacity of the lungs to allow oxygen and carbon dioxide to pass in and out of the blood." This exchange happens at the alveoli, the lungs' tiny air sacs. The book states that "regular sub-maximal exercise training develops the scope of increasing the exchange of gases, and in this process the size of the alveoli also increases" - a larger alveolar surface area means more oxygen can diffuse into the blood (and more carbon dioxi …