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Figure 36-2
Carbon dioxide (CO2
) content of arterial blood
as a function of PCO2
. For a given PCO2
deoxygenated blood has a higher CO2
content than oxygenated blood (i.e.,
Haldane effect). Unlike the HbO2
saturation curve, the CO2
content curve has no plateau and can be approximated by a straight line in the clinically
useful range. (Data from Christiansen J, Douglas CG, Haldane JS: The absorption
and dissociation of carbon dioxide by human blood. J Physiol [Lond] 48:244, 1914.)
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