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Ventilation and blood gases were measured in unanesthetized ducks at various levels of inspired CO2 partial pressure (PICO2). Ventilation was markedly augmented with increasing PICO2, whereas arterial and mixed venous PCO2 stayed essentially constant up to a PICO2 of about 20 torr and changed only slightly between that and the highest level tested (34 torr). After carbonic anhydrase had been blocked, blood PCO2 was elevated at all levels of PICO2 but the ventilatory response to increases in PICO2 were attenuated. The response to CO2 in the normal bird (before administration of acetazolamide) shows similarities to that in mammals. Qualitative differences between both classes of vertebrates after blockade of carbonic anhydrase may, however, suggest differences in their systems that control ventilation.
F L Powell, and
M R Fedde, and
R K Gratz, and
P Scheid
October 1954,
The American journal of physiology,
F L Powell, and
M R Fedde, and
R K Gratz, and
P Scheid
January 2006,
Journal of applied physiology (Bethesda, Md. : 1985),
F L Powell, and
M R Fedde, and
R K Gratz, and
P Scheid
January 2001,
Physiological research,
F L Powell, and
M R Fedde, and
R K Gratz, and
P Scheid
June 1988,
Journal of applied physiology (Bethesda, Md. : 1985),
F L Powell, and
M R Fedde, and
R K Gratz, and
P Scheid
June 1981,
Journal of applied physiology: respiratory, environmental and exercise physiology,
F L Powell, and
M R Fedde, and
R K Gratz, and
P Scheid
January 1986,
Bulletin europeen de physiopathologie respiratoire,
F L Powell, and
M R Fedde, and
R K Gratz, and
P Scheid
January 1979,
Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine (New York, N.Y.),
F L Powell, and
M R Fedde, and
R K Gratz, and
P Scheid
January 1984,
Psychosomatic medicine,
F L Powell, and
M R Fedde, and
R K Gratz, and
P Scheid
July 1968,
British journal of diseases of the chest,
F L Powell, and
M R Fedde, and
R K Gratz, and
P Scheid
February 1978,
Chest,
