肌球素

例句：

1. 1. The muscle fibers are made up of myofibrils and myoglobin.
   肌肉纤维由肌原纤维和肌红蛋白组成。
2. 2. Myoglobin is responsible for oxygen transport in the muscles.
   肌红蛋白负责肌肉中氧气的运输。
3. 3. Myoglobin is a protein found in red blood cells that carries oxygen to the muscles.
   肌红蛋白是一种存在于红细胞中的蛋白质，它携带氧气到肌肉中。