Specifically, that club-headed myosin wants to get all up-close-and-personal with the actin.

具体来说，棒状头肌球蛋白想近距离接触肌动蛋白。

Like the actin and myosin in our muscles that enable us to move.

就像我们肌肉中的肌动蛋白和肌球蛋白一样，它们使我们能够移动。

Actin and myosin, the proteins of muscles, permit those bodies to move around.

肌动蛋白和肌球蛋白， 肌肉的蛋白质， 允许这些身体四处移动。

They've got their own famous coupling — a pretty pair of tiny protein strands called actin and myosin.

它们有自己著名的联结——一对漂亮的微小蛋白质链，叫做肌动蛋白和肌球蛋白。

But the only myosin heads that can bind to those newly exposed sites are ones that are ready for action.

但是唯一能与这些新暴露的部位结合的肌球蛋白头是那些准备好行动的。

Then comes a brief period of contraction, when the myosin heads are binding, and pulling, and releasing, over and over, and the muscle fibers contract.

然后是短暂的收缩，这时肌球蛋白头一遍又一遍地结合、拉动和释放，肌肉纤维收缩。

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的部分，其中包含两股更小的蛋白质——两种不同的肌丝称为肌动蛋白和肌球蛋白。

At this point, the myosin is totally stoked, because the bodyguards that have been frustrating it are in for a big, irresistible distraction.

在这一点上，肌球蛋白完全兴奋起来，因为一直让它沮丧的保镖会有一个巨大的、不可抗拒的分心。

A sarcomere contains both thin filaments, made up mostly of two light and twisty actin strands, and thick filaments, composed of thicker, lumpy-looking myosin strands.

肌节既包含细丝，主要由两条轻盈而扭曲的肌动蛋白链组成，也包含粗丝，由更厚、看起来块状的肌球蛋白链组成。

When those channels are thrown open, the calcium stored inside rushes into the rest of the cell, and finally myosin is like, YES! Here we go!

当这些通道打开时，储存在其中的钙会涌入细胞的其余部分，最后肌球蛋白就像，是的！开始了！