THE INDIVIDUAL GROUPS OF PROTEINS 



The Gases of the Blood. 



The average content of arterial and venous blood is : 



Oxygen 



Carbon Dioxide 

 Nitrogen 



Arterial Blood. Venous Blood. 



20 8-12) 



40 46-50 [c.c. per 100 c.c. 



1-2 1-2 ) 



The nitrogen is the same in both; arterial blood contains 8-12 

 c.c. more oxygen than venous and 6-io c.c. less carbon dioxide. 



Estimation of the Gases of the Blood. 



Gases can be expelled from liquids by boiling or by exposing them to a 

 vacuum. A combination of the two processes is used in estimating the 

 gases of the blood. The gases are collected and analysed. 



FIG. 72. (From J. Physiol., 39, 433, Cambridge University Press.) 



Extraction of the Gases. 



The expulsion of gases from blood is carried out in the apparatus 

 devised by Barcroft and shown in Fig. 72. 



I 



