Reactivation process of calcium current-independent tonic tension in bullfrog atrium.

The time constant of reactivation process of ICa-independent tonic tension in bullfrog atrial muscle was temperature-dependent and cyanide-sensitive. The cyanide effect and the Q10 value (2.8) of the time constant of the reactivation process suggest that the tonic tension is at least partially mediated by some metabolic process.