102 



RESPIRATION 



dissociation, two, namely rise of temperature and increased 

 hydrogen ion concentration, and perhaps the third, altera- 

 tion in the quantity of electrolytes, occur as the result of 

 cellular activity. When the cell needs more oxygen, then 

 the thermal and chemical effects of its activity are such as 

 to increase the tendency of the blood to part with its oxygen 

 to the tissues. 



10. 

 Fig. 



20 



30 



w 



50 60 



70 



80 90 100 HO no 110 IW 



22. — Dissociation curve of oxyhemoglobin with different tensions 

 of COo. The lowest curve is at a CO, tension of 420 mm. Hg. 



The Transport of CO2 



As this problem is intimately connected with the ques- 

 tion of the reaction of the blood the reader is advised to 

 refer to pp. 17-20. Here we may say that COg is not 

 carried in the blood as NaHCOg and dissociated in the lungs, 

 for under the conditions in which it exists in the blood 



