title: Closing volume.
mesh_terms: D000367:Age Factors; D000368:Aged; D006801:Humans; D008722:Methods; D008875:Middle Aged; D009584:Nitrogen / Q000378:metabolism; D011187:Posture; D012119:Respiration; D012129:Respiratory Function Tests; D012140:Respiratory Tract Diseases / Q000175:diagnosis*; D012907:Smoking / Q000150:complications; D014797:Vital Capacity
chemical_list: D009584:Nitrogen