title: Gas diffusion across collateral channels.
mesh_terms: D000402:Airway Obstruction / Q000503:physiopathology*; D000818:Animals; D004058:Diffusion; D004285:Dogs; D005459:Fluorides; D006371:Helium; D066298:In Vitro Techniques; D008168:Lung / Q000503:physiopathology*; D008954:Models, Biological; D009584:Nitrogen; D011650:Pulmonary Alveoli / Q000503:physiopathology; D011653:Pulmonary Diffusing Capacity; D013147:Spirometry; D013455:Sulfur; D013552:Swine; D014692:Ventilation-Perfusion Ratio; D014797:Vital Capacity
chemical_list: D006371:Helium; D013455:Sulfur; D009584:Nitrogen; D005459:Fluorides