Helium closing volumes.
D000328:Adult; D000403:Airway Resistance; D006371:Helium; D006801:Humans; D008168:Lung / Q000502:physiology*; D008171:Lung Diseases / Q000175:diagnosis; D008176:Lung Volume Measurements / Q000379:methods*; D009590:Nitrogen Radioisotopes; D012123:Pulmonary Ventilation; D011868:Radioisotopes
D009590:Nitrogen Radioisotopes; D011868:Radioisotopes; D006371:Helium