Effect of rhubarb on contractile response of gallbladder smooth muscle strips isolated from guinea pigs

Figure 1 Effect of rhubarb on resting tension (g), mean contractile amplitude (mm) and frequency (waves/min) of isolated guinea pig gallbladder muscle strips (n = 12). A: resting tension; B: the mean contractile amplitude; C: frequency. ^aP<0.005, ^bP<0.001 vs control (the gallbladder spontaneous contraction under 1 g initial load when rhubarb was 0 g/L). The resting tension of each strip in control was 0.