Verapamil reduced only the norepinephrine or urotensin II induced contraction while in the presence of extracellular Ca2+, with little or no modify from the contraction in Ca2+-free buffer. The urotensin I induced relaxation reaction in aortic strips contracted by forty mM KCl was enhanced by pretreatment with papaverine or forskolin. https://aristotleg555wiu9.blogscribble.com/profile