【单选题】【消耗次数：1】
有面有关骨骼肌说法错误的是
①
骨骼肌受意识支配
②
骨骼肌细胞核多
③
骨骼肌光镜下可看到明暗相间的条纹
④
骨骼肌细胞核位于细胞中央
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相关题目
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对骨骼肌光镜结构的错误描述是（）
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胞核多位于肌纤维的周缘分布
②
可看清基质内充满细肌丝和粗肌丝
③
可分辨出肌原纤维的明暗相间的横纹
④
骨骼肌的肌质内充满了肌原纤维
⑤
每个骨骼肌纤维的细胞核可多达几十个甚至上百个
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肌浆网，即肌纤维内的滑面内质网
②
形成骨骼肌横纹的结构基础是肌原纤维
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骨骼肌收缩时能与肌球蛋白分子头部结合的是肌动蛋白
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肌膜在Z线水平向内凹陷形成横小管
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关于骨骼肌收缩机制，下述错误的是（）
①
引起兴奋－收缩耦联的离子是Ca<sup>2+</sup>；
②
细肌丝向粗肌丝滑行；
③
Ca<sup>2+</sup> 与横桥结合；
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横桥与肌纤蛋白结合；
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肌节缩短
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