兽医药理学-第四章 血液循环系统药理-2012.pdf
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前负荷
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v作用机理
Ca2+介导心肌收缩。强心苷能增加心肌细胞内的Ca2+ 。原理是能
+ +
与心肌细胞膜上的Na 、K —ATP酶发生特异性结合。抑制心肌
+ + + 2+
细胞膜上的Na —K —ATP酶,抑制细胞外Na —Ca 的交换,
心肌细胞内Ca2+↑,肌浆网内Ca2+↑,心肌收缩力增强。
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