Oxygen and Carbon Dioxide Transport by Blood Containing Haemocyanin 



The Haldane effect is not very marked in the decapods, and is absent 

 in the blood of the edible snail 15 {Figure 7). In the squid, however, the 

 Haldane effect is very marked and is largely responsible for the carbon 

 dioxide exchange in the gills (Redfield, Coolidge and Hurd 1 ). 



70 



60 



50 



c 40 



<o 



jo- 



2 20 



10 



Helix Pom a t/o L t 20° 

 a Reduced Blood 

 1 Oxygenated Blood 



10 20 JO 



40 SO 

 *CO, 



60 70 80 



Figure 1. Carbon dioxide dissociation 

 curves of the blood of the edible snail. 



The question whether part of the carbon dioxide might be transported 

 in the form of carbamate was investigated for the blood of the lobster, 



140 



ISO 



200 220 240 



20 



40 



60 80 100 120 

 Time in Second's 



140 



20 40 60 80 100 

 PCO, 



Figure 8. Absorption of carbon dioxide by the blood of the 

 edible snail in the apparatus of Stadie and O'Brien 1 '' at different 

 CO 2 pressures. The small graph gives the relation of the 

 .amount of C0 2 quickly absorbed with the C0 2 pressure in the 

 gas mixture ( Wolvekamp and Kruyt 1 '). 



309 



