Cardiac Transmembrane Potentials are Prolonged The electrical behavior of -SAN (005) cardiac cells differs considerably AM (0.4) from that of nerve cells or of AVN (002) smooth or skeletal muscle ceils in (0.2) general, the durations of action potentials are much longer in (20) cardiac cells than in nerve cells or (40) in smooth or skeletal muscle cells VM (10) The action potentials differ 0300600 substantially among various 时间(ms) type of cardiac cells depending 图4-5心脏各部分心肌细胞的 跨膜电位和兴奋传导速度 on the function and location of sAN:窦房结AM:心房肌AMN:结区BH1希氏束 PF:浦肯野纤维TPF末梢浦肯野纤维VM:心室肌 those cells 传导速度单位m/sCardiac Transmembrane Potentials are Prolonged The action potentials differ substantially among various type of cardiac cells depending on the function and location of those cells. The electrical behavior of cardiac cells differs considerably from that of nerve cells or of smooth or skeletal muscle ceils. in general, the durations of action potentials are much longer in cardiac cells than in nerve cells or in smooth or skeletal muscle cells