【单选题】【消耗次数：1】
兴奋收缩耦联中的关键离子是( )
①
Na+
②
K+
③
Cl
④
-Ca2+
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相关题目
【单选题】
在骨骼肌兴奋-收缩耦联过程中起关键作用的离子是（）
①
Na<sup>+</sup>；
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K<sup>+</sup>；
③
Ca<sup>2+</sup>；
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Cl<sup>-</sup>；
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Mg<sup>2+</sup>
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