They're divided lengthwise into segments called sarcomeres, which contain two even tinier strands of protein — two different kinds of myofilaments called actin and myosin.

它们在纵向上被分成称为肌节部分，其中包含股——种不同肌丝称为肌动和肌球。

You'd also re-learn that your skeletal muscles are constructed like a rope made of bundles of protein fibers, and that the smallest strands are your actin and myosin myofilaments.

你还会重新了解到你骨骼肌就像一根由成束纤维组成绳子，最链是你肌动和肌球肌丝。