Figure 1: Vasorelaxant effects of aqueous extract of Zygophyllum album (Za) (A) and Acetylcholine (B) on the endothelium denuded or endothelium intact mice aortic rings precontracted by 10-7 M U46619. The relaxation effect was expressed as a percentage of decrement to the maximum tension caused by 10-7 M U46619. n = 6 (six isolated aortic rings from six mice).