[Cardiorespiratory effects of exogenous hypercapnia in eels].
The study of electrocardiogram and opercular movement records, from eels exposed for prolonged periods to hypercarbic water (saturation by the gaseous mixture 2% CO2, 98% air) shows that 1) heart rate is not significantly changed; 2) the duration of spontaneous apnea phases and the magnitude of opercular movements during ventilatory phases are increased under hypercapnic conditions. Because the integrated records of opercular movements only give an arbitrary estimate of changes in ventilation rate, direct measurements of the ventilation volume were performed in order to state the way of the dominant action of CO2. This method allows us to conclude that exogenous hypercapnia significantly decreases the ventilatory rate in eels.
D000818:Animals; D001049:Apnea / Q000503:physiopathology; D004524:Eels / Q000502:physiology*; D006339:Heart Rate; D006935:Hypercapnia / Q000503:physiopathology; D012119:Respiration
Etude des effets cardio-ventilatoires de l'hypercapnie exogène chez l'anguille