Evidence that a cyclic rise in avian pulmonary CO2 triggers the next inspiration.
D000818:Animals; D002245:Carbon Dioxide; D002628:Chemoreceptor Cells / Q000502:physiology*; D002642:Chick Embryo; D002645:Chickens / Q000502:physiology*; D004285:Dogs; D008297:Male; D008954:Models, Biological; D010507:Periodicity; D012119:Respiration; D013990:Tidal Volume
D002245:Carbon Dioxide