题目内容
心交感神经效应的主要机制为( )
2021-10-17
A.增加心肌细胞膜上Ca2+通道的开放概率
B.增强自律细胞4期的内向电流
C.减慢心肌复极相K+外流
D.减慢肌质网钙泵对Ca2+的回收
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