240 



Chapter XVI 



will be higher. These factors form the necessary chemical and 

 physical complement to vascular dilatation and more rapid flow of 

 blood through the capillaries. Our picture of the capillary circula- 

 tion through the active tissues is that each corpuscle spends less 



100 



80 



7C 



60 



50 



30 



20 



10 



IP 20 3O 40 50 60 70 80 90 100 



0- 



to- 



70 



100 



20 



60 



7O 60 90 100 



BARCROFT 



Mesectic 



Meionectic 



CARLINGFORD 

 lOOO'in 45 mins 



100 



10 20 30 40 50 60 70 80 8O 100 



FIG. 113. Showing changes in the dissociation curve as the result of climbing. The 

 dotted curve is in each case the one which results from exercise. 



time in the capillaries ; each corpuscle is reduced to about the same 

 extent as during rest ; this is made possible by the diminished value 

 of K. More oxygen leaves the blood, and this again can only diffuse 

 out by a rise in the intra-capillary oxygen pressure combined with 

 a fall in the extra-capillary oxygen pressure. It must be borne in 



