Fig. 6.

Intracellular Ca²⁺ properties of cardiomyocytes from C3H/HeN and C3H/HeJ hearts. (A) The intracellular Ca²⁺ levels; (B) The rise in intracellular Ca²⁺ levels in response to electrical stimulus; (C) The first exponential decay constant of intracellular Ca²⁺ and (D) The bi-exponential decay constant of intracellular Ca²⁺ of C3H/HeN and C3H/HeJ in response to hypoxia (30 min.). Values are mean ± S.E.M. for six experiments, *P< 0.05 versus control, respectively. †P< 0.05 versus C3H/HeN hypoxia.