Figure 8.

Inhibitory effect of (A) Mc.Cr and (B) verapamil on the force and rate of spontaneous contractions of isolated guinea-pig atria. ^#P < 0.05; ^##P < 0.01; ^###P < 0.001; show comparison of concentration-dependent effects on force while *P < 0.05;**P < 0.01; ***P < 0.001; show comparison of concentration-dependent effects on rate of guinea-pig atria.