Fig. 3. (A) Glycogen and (B) free glucose levels in the cod (Gadus morhua) perfused heart subjected to either normoxic or hypoxic conditions, with or without 5 mmol l^-1 glucose, or hypoxic conditions with 5 mmol l^-1 glucose and 25 µmol l^-1 cytochalasin B in the medium. These levels were taken after 120 min or immediately after the heart failed. All values are means ± S.E.M. and N=6–11 fish. ^*Significantly different from normoxia + glucose group (P<0.05). In the normoxic without glucose group, free glucose levels were not significantly different when compared with the normoxic with glucose group (P=0.054).