title: Small airway closure, and its physiological significance.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000402:Airway Obstruction / Q000503:physiopathology*; D002648:Child; D006801:Humans; D008168:Lung / Q000503:physiopathology*; D008170:Lung Compliance; D008176:Lung Volume Measurements; D008297:Male; D008875:Middle Aged; D011187:Posture; D011653:Pulmonary Diffusing Capacity; D014980:Xenon Radioisotopes
chemical_list: D014980:Xenon Radioisotopes