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同一骨骼肌细胞在接受其运动神经元的冲动刺激后产生的2次终板电位中，第2个终板电位的振幅发生了变化，幅度明显降低，这可能是因为( )
A
切断了运动神经元
B
在浸泡液中加了肾上腺素
C
在浸泡液中加了去甲肾上腺素
D
在浸泡液中加了箭毒
E
在浸泡液中加了钠离子
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试题答案：
E
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