Contractile response property of coronary arteries induced by K<sup>+</sup>, S6c and ET-1. CaoLei ZhangYaping CaoYong-Xiao EdvinssonLars XuCang-Bao 2013 <p>The coronary arteries were isolated from rats exposed to fresh air, cigarette smoke and cigarette smoke plus GW5074 (0.5 mg/kg). E<sub>max</sub> represents maximal contraction, pEC<sub>50</sub> represents the negative logarithm of the agonist concentration that produces 50% of the maximal contractile effect. Coronary artery contractile responses were induced by K<sup>+</sup>, S6c and ET-1. K<sup>+</sup>-induced responses were expressed as absolute values of contraction (mN), and S6c and ET-1-elicited responses were expressed as percentage of K<sup>+</sup>-induced contraction. Statistical analysis was performed with unpaired student's <i>t</i>-test with Welch's correction.</p>**<p><i>P</i><0.01 <i>vs.</i> fresh air group;</p>##<p><i>P</i><0.01 <i>vs.</i> smoke group.</p>