Lung volume, volume history, and the distribution of inhaled boluses.
D003011:Closing Volume; D006371:Helium; D006801:Humans; D008168:Lung / Q000502:physiology; D008176:Lung Volume Measurements; D008297:Male; D011187:Posture; D012119:Respiration; D014797:Vital Capacity
D006371:Helium