title: The black box illuminated.
mesh_terms: D006801:Humans; D008954:Models, Biological; D009584:Nitrogen; D010100:Oxygen; D011650:Pulmonary Alveoli / Q000502:physiology*; D012119:Respiration; D014692:Ventilation-Perfusion Ratio
chemical_list: D009584:Nitrogen; D010100:Oxygen