An Inotropic Action Caused by Muscarinic Receptor Subtype 3 in Canine Cardiac Purkinje Fibers

Figure 4

IP₃ levels in canine cardiac Purkinje fibers treated by ACh or ACh and atropine (Atr). Columns with vertical bars indicate the mean ± SEM (𝑛=5). ∗<0.05, ∗∗<0.01 significantly different from each other (paired Student’s t-test).