Fig. 2. Predicted blood oxygen dissociation curves in vivo for Python molurus while fasting (broken line) and during the postprandial period (solid line). These blood oxygen-dissociation curves were predicted on the basis of arterial pH in vivo as well as in vitro Bohr effects and blood oxygen affinities (see text for further explanation). The open symbols represent the measurements of arterial oxygen partial pressure (P_O2) and haemoglobin-bound oxygen (HbO₂) saturations in vivo (given as means ± 1 S.E.M.), while closed symbols represent predicted venous values (circles and squares for fasting and postprandial snakes, respectively). The insert shows the corresponding Hill plots.