Figure 4.
Bar charts showing the inhibitory effects of (A) the crude extract of Viola odorata (Vo.Cr) and (B) verapamil on phenlyephrine responses in Ca++ free Kreb's solution in isolated rat aorta preparations. Values shown are mean ± SEM; n = 4; *** P < 0.001; one way ANOVA (Tukey's multiple comparison).