肌肉伸縮(英語:Muscle contraction)是通過肌動蛋白肌球蛋白共同完成的。當突觸發生動作電位的時候,鈣離子就會進入肌肉,肌肉通過三磷酸腺苷(ATP)產生能量從而扭曲肌肉纖維,因此導致肌球蛋白的進入。

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