Fig. 1. Power output (%) of isolated cod (Gadus morhua) hearts perfused under 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. All values are means ± S.E.M. Numbers under the first data point represent the total number of hearts perfused in that group. Numbers after this initial point correspond to the number of hearts still functioning at that time.