心肌工作细胞动作电位0期形成的主要原因是( )

A、Na[img=~\/QImg\/2013-06-27-14-49-35\/image001.gif]内流
B、Ca[img=~\/QImg\/2013-06-27-14-49-35\/image006.gif]抖内流
C、K[img=~\/QImg\/2013-06-27-14-49-35\/image001.gif]外流
D、Cl[img=~\/QImg\/2013-06-27-14-49-35\/image007.gif]内流
E、Na[img=~\/QImg\/2013-06-27-14-49-35\/image001.gif]-K[img=~\/QImg\/2013-06-27-14-49-35\/image001.gif]泵生电作用