Fig. 5. Changes in intracellular [K+] (means ± s.e.m.) in muscle
and heart (A) and extracellular [Na+] (B) in frogs during 16 weeks
of cold-submerged (4°C) normoxia (air equilibrated water; open symbols)
and hypoxia (60 mmHg; closed symbols). (From
Donohoe et al., 2000.)