单选题:(题共用备选答案)A.Cl-内流B.Ca2+内流C.Na+内流D.K+内流E.K+外流窦房结细胞动作电位0期去极化是由于

题目内容:
(题共用备选答案)
A.Cl-内流
B.Ca2+内流
C.Na+内流
D.K+内流
E.K+外流
窦房结细胞动作电位0期去极化是由于(  )
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