title: Gas mixing during breath holding studied by intrapulmonary gas sampling.
mesh_terms: D000818:Animals; D004058:Diffusion; D004285:Dogs; D006321:Heart / Q000502:physiology; D008722:Methods; D011650:Pulmonary Alveoli / Q000502:physiology*; D012119:Respiration; D012126:Respiratory Dead Space; D013997:Time Factors; D014692:Ventilation-Perfusion Ratio