肌动球蛋白

例句：

1. 1. The muscle contraction is essential for movement.
   肌肉收缩对于运动至关重要。
2. 2. Myosin is a key protein in muscle function.
   肌动蛋白是肌肉功能的关键蛋白质。
3. 3. Actin is responsible for the formation of muscle fibers.
   肌动蛋白负责形成肌肉纤维。