Respiration.
D000136:Acid-Base Equilibrium; D000531:Altitude; D006112:Gravitation; D006801:Humans; D008722:Methods; D005082:Physical Exertion; D012119:Respiration / Q000502:physiology*; D012129:Respiratory Function Tests; D012140:Respiratory Tract Diseases / Q000503:physiopathology