Transmembrance potential of ventricular cell and their ionic basis 实房结 心心房肌 结区 希氏束 浦肯野 纤维 末梢浦肯野 纤维 心室肌 300 600ms 剧4-6心脏各部分心肌胞的跨膜电立Transmembrance potential of ventricular cell and their ionic basis