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Figure 3


Fig. 3. Comparison of arterial (red) and venous (blue) blood in terms of PO2 (A) and O2 content (B). The venous system is highly saturated; PO2 and O2 content in both the arterial and venous blood become indistinguishable soon into apnea. (Regression equations are the same as in Figs 1 and 2.)