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Figure 7


Fig. 7. Plots of Mb facilitated O2 diffusion vs free O2 flux as a function of PO2 at 25°C. The equation Formula describes the linear rise of free O2 flux with PO2. Krogh's diffusion coefficient, K0, is the proportionality constant and the slope. The straight line shows the rate of change at a K0 value of 2.52x10–5 ml O2 cm–1 min–1 atm–1 at 23°C. The broken line graphs the equation Formula, the Mb-facilitated O2 diffusion as a function of PO2, P50=1.5 mmHg (1 mmHg=0.133 kPa), CMb=3.8 mmol l–1 and DMb=4.5x10–7 cm2 s–1. The equipoise PO2 67 mmHg corresponds to the intersection of the two curves. Below 67 mmHg, the Mb contribution dominates.





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