ET,Car和Oxy使在高钾液中的雌激素处理和早、中、晚孕的小鼠子宫产生浓度依赖性张力增加,ET对晚孕子宫的 E_(max)是早孕者的1.33倍,Car对中孕子宫的 E_(max)为晚孕者的2倍,Oxy对晚孕子宫的E_max是中孕者的3.2倍。ET对不同孕期子宫的EC_(50)无显著差别,是Car的2％—7％,为Oxy的3—15倍。表明ET对小鼠子宫的兴奋作用不同于Car和Oxy。 ET, Car and Oxy increased estrogen-induced estrogen in high potassium solution and concentration-dependent increase in uteri of mice in early, middle and late pregnancy. ET in pregnant uterus was 1.33 times higher than that in early pregnancy, Car was twice as large as that of the pregnant women in the second trimester of pregnant women, and Exygen of the second trimester of pregnant women was 3.2 times higher than that of the third trimester. There was no significant difference in EC 50 between different pregnant uteruses, which was 2% -7% of Car and 3-15 times of Oxy. Indicating that the excitatory effect of ET on mouse uterus is different from that of Car and Oxy.