Figure 4.

Effect of cumulative concentrations of Teucrium polim extract (1, 2, 4, and 8 mg/ml) on rat aortic rings without endothelium (−E) contracted with PE (10⁻⁶ M) (PE − E) (a) or KCl (6 × 10⁻² M) (KCl − E) (b) and after diltiazem (10⁻⁵ M) pretreatment (PE + Dil, KCl + Dil). Data are expressed as mean ± SEM (n = 8). *P < 0.05, **P < 0.01, ***P < 0.001 compared to PE − E or KCl – E. PE: Phenylephrine; KCl: Potassium chloride; SEM: Standard error of mean