【单选题】【消耗次数：1】
心室肌细胞动作电位平台期的形成主要是由于
①
Ca2+内流、K+外流
②
Ca2+外流、K+内流
③
Na+内流、Cl-外流
④
Na+内流、K+外流
⑤
Ca2+内流、Na+外流
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细胞膜内外正常Na+和K+浓度差的形成和维持是由于
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膜在安静时对K+通透性大
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膜在安静时对Na+通透性大
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心室肌细胞动作电位平台期的形成主要是由于
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Ca2+内流、K+外流
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Ca2+外流、K+内流
③
Na+内流、Cl-外流
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Na+内流、K+外流
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Ca2+内流、Na+外流
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