title: The volume of trapped gas, closing volume and pulmonary gas exchange in smokers and non-smokers aged 60.
mesh_terms: D001835:Body Weight; D005541:Forced Expiratory Volume; D006801:Humans; D008176:Lung Volume Measurements; D008297:Male; D008875:Middle Aged; D010313:Partial Pressure; D012119:Respiration; D012907:Smoking / Q000503:physiopathology*; D013147:Spirometry; D014692:Ventilation-Perfusion Ratio