一.心肌细胞的动作电位有何特点? 其离子基础如何? 心肌细胞在兴奋时膜两侧发生的电位变化称心肌细胞的动作电位。心脏各部位心肌细胞的动作电位基本类似,但又有差别。现以心室肌细胞为例。一般认为该动作电位包括去极和复极两个主要过程,并可分为五个时期,其中0期属于去极过程,1～4期属于复极过程。0期也称去极期。当心室肌细胞在窦房结传来的冲动影响下,使膜内负电位减少到阈电位(约—70毫 What are the characteristics of cardiomyocytes action potential? The basis of their ion? Myocardial cells in the excitement when the potential changes occurred on both sides of the membrane that the action potential of myocardial cells. The action potentials of heart cells in all parts of the heart are basically similar, but there are differences. Now take ventricular myocytes as an example. It is generally considered that the action potential includes two main processes of depolarization and repolarization, and can be divided into five periods, of which stage 0 belongs to the depolarization process and stages 1 to 4 belong to the repolarization process. 0 period also known as the pole period. When ventricular myocytes in the impulse of the sinoatrial node, the negative potential within the membrane decreased to the threshold potential (about -70 milligram