RESPIRATION 



sorption curve for CO 2 will follow the thick line downwards. It 

 will be seen that, if we assume the resting excess pressure of CO 2 

 in the venous blood, the quantity of CO 2 given off when the CO 2 

 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 



50 



40 



/A 



80 



90 



30 40 50 60 70 



PRESSURE of CO 2 in MM. Hq. 



Figure 26. 



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

 ence of hydrogen and CC>2. 



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

 ence of hydrogen and CC>2. 



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

 ence of air and CO 2 (Bohr's data). 



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

 of J. S. H. within the body. 



of CO 2 in volumes per cent in the venous blood, the discharge of 

 CO 2 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 



