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Chapter X 



would simply spread out the curve. Compare the curves given in 

 Fig. 86. In both cases A and B, the dotted line shows a large pro- 



20 30 40 50 60 70 80 90 100 



10 



10 20 30 40 50 60 70 80 90 100 



FIG. 86. A, dissociation curves of haemoglobin solution. 



= dissociation curve of 



haemoglobin at 38 C. - =the effect which C0. 2 would produce if there were 



no aggregation of the molecules. B, dissociation curves of blood. = without 



C0 2 . - = 40 mm. CO., pressure. Ordinate = percentage saturation with oxygen. 



Abscissa = oxygen pressure. 



portional increase in the pressure at any given percentage saturation 

 as compared with the thick line. At low percentage saturations, 



