Figure 9From: Potassium channel openers and prostacyclin play a crucial role in mediating the vasorelaxant activity of Gynura procumbens Concentration-relaxation curves for F1 in the isolated rat aortic rings. The F1-induced relaxation was studied on PE-precontracted endothelium-intact aortic rings preincubated with atropine or propanolol. Value are mean ± S.E.M (n = 6).Back to article page