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血钾浓度过高可使心脏
A．兴奋性降低 B．传导性降低 C．自律性降低
D．收缩力减弱 E．严重时心室停搏于舒张期

A.兴奋性降低
B.传导性降低
C.自律性降低

D.收缩力减弱

【参考答案】

ABCDE血钾浓度过高，膜电位过低，处于备用状态的钠通道过少，因而兴奋性降低。高钾时由于处于备用状态的钠通道少，兴奋时开......

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