RESPIRATION 



91 



sorption curve for CO2 will follow the thick line downwards. It 

 will be seen that, if we assume the resting excess pressure of CO2 

 in the venous blood, the quantity of CO2 given off when the CO2 

 pressure in the lung capillaries falls to that of the alveolar air 

 will be about 55 per cent greater than if no oxygenation had oc- 

 curred. If, on the other hand, we assume a certain excess charge 



75 



I 



§65 



70 



60 



^ 50 

 I 40 





80 



90 



H<). 



30 AO 50 60 70 



PRESSURE of CO^ m MM. 

 Figure 26. 



Upper curve — absorption of CO2 by blood of J. S. H. in pres- 

 ence of hydrogen and CO2. 



Middle curve — absorption of CO2 by blood of J. S. H. in pres- 

 ence of hydrogen and CO2. 



Lower curve — absorption of CO2 in blood of ox and dog in pres- 

 ence of air and CO2 (Bohr's data). 



Thick line A — B represents the absorption of CO2 by the blood 

 of J. S. H. within the body. 



of CO2 in volumes per cent in the venous blood, the discharge of 

 CO2 will ordinarily be about 55 per cent greater than if no oxy- 

 genation had occurred. 



We can also see that under abnormal conditions, such as may 

 easily occur when the breathing is suspended or reduced in 



