Fig. 3. Effects of hypoxia (FI_O2=fraction of oxygen in the inspired air) on blood flows before and after reducing haematocrit (filled and unfilled circles, respectively). (A,B) Pulmocutaneous blood flow (_pc); (C,D) systemic blood flow (_sys); (E,F) net shunt fraction (_pc/_sys) and (G,H) net shunt flow (_shunt). The dotted lines represent the condition where there is no net shunt. Significant effects of hypoxia within each of the two groups (normal and low haematocrit, respectively) are marked with an asterisk, and significant differences between the groups are marked with a dagger. B, D, F and H show data for toads with normal [O₂] during normoxia, toads with normal [O₂] during hypoxia (FI_O2=0.10), and anaemic toads during normoxia. Significant differences between normoxic and hypoxic animals are marked with `a', and differences between normoxic and anaemic animals are marked with `b'. Data are presented as means ± 1 S.E.M. (N=6).

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