Fig. 2. Recordings of heat dissipation showing the metabolic depression response to anoxia in (A) turtle brain cortical slices incubated in oxygen-free medium (nitrogen) or in the presence of sodium cyanide (pharmacological anoxia) at 25°C (Doll et al., 1994), (B) turtle hepatocytes, where CN denotes addition of sodium cyanide to cell preparations incubated in oxygen-free medium (dotted line) or normoxic medium (solid line) at 25°C (from Buck et al., 1993a, with permission from the American Physiological Society), (C) frog sartorius muscle exposed to a progressively developing oxygen-free superfusate at 20°C (from West and Boutilier, 1998, with permission from Springer) and (D) frog heart ventricular ring (20mg) exposed to a progressively developing oxygen-free superfusate at 20°C (T. G. West and R. G. Boutilier, unpublished data). Turtle, Chrysemys picta belli; frog, Rana temporaria. 1mmHg=0.133kPa.