心肌的興奮性

　　suoyouxinjixibaodoujuyouxingfenxing
，jijuyouzaishoudaocijishichanshengxingfendenengli。hengliangxinjidexingfenxing，tongyangkeyicaiyongcijideyuzhizuozhibiao
，yuzhidabiaoshixingfenxingdi，yuzhixiaobiaoshixingfenxinggao。