title: Effect of density of gas mixtures on the work of the respiratory apparatus.
mesh_terms: D000328:Adult; D000403:Airway Resistance; D005740:Gases; D006371:Helium; D006801:Humans; D008297:Male; D008451:Maximal Voluntary Ventilation; D010100:Oxygen; D012123:Pulmonary Ventilation; D012119:Respiration; D012129:Respiratory Function Tests; D013459:Sulfur Hexafluoride
chemical_list: D005740:Gases; D006371:Helium; D010100:Oxygen; D013459:Sulfur Hexafluoride