Lung volumes.
D000375:Aging; D006371:Helium; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging; D008176:Lung Volume Measurements; D009584:Nitrogen; D010993:Plethysmography, Whole Body; D011187:Posture; D011859:Radiography; D012016:Reference Values; D013147:Spirometry; D014797:Vital Capacity
D006371:Helium; D009584:Nitrogen