A muscle contracting is all about sarcomeres contracting, bringing those Z-lines closer together.

收缩就是节收缩，使这些 Z 线更靠近。

In the process, it shrinks the whole sarcomere, and contracts the muscle.

在这个过程中，它会收缩整个节，收缩。

Well that hypertrophy is concentric, which means that the new sarcomeres are generated in parallel with existing ones.

肥大是向心性的，这意味着有新节产生，与之前的行生长。

Its their use of calcium and ATP that causes the binding and unbinding that makes sarcomeres contract and relax.

正是它们对钙和三磷酸腺苷的使用导致了使节收缩和放松的结合和松弛。

For skeletal muscles, improved flexibility comes from additional sarcomeres, which allow you to maintain strength at even greater lengths.

对骨骼， 增加的柔韧性来自的节，这使您可以在更长的距离内保持力量。

At the smaller scale, these skeletal muscle fibers are comprised of millions of sarcomeres— the smallest contracting unit of muscle tissue.

在较小的尺度上，这些骨骼纤维由数百万个节组成——组织的最小收缩单位。

Sarcomeres are added and subtracted to muscles depending on how frequently they're used, so improving overall flexibility requires a comprehensive stretching regimen.

节的增减取决的使用频率，因此提高整体柔韧性需要全面的拉伸方案。

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节的部分，其中包含两股更小的蛋白质——两种不同的丝称为动蛋白和球蛋白。

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.

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

You might be able to piece a guess together by the shape, color, bones, and myotomes which are the little meat squiggles you see on the fish.

你也许可以根据形状、颜色、骨头和节（你在鱼上看到的小曲线）拼凑出一个猜测。

Sarcomere's long, fibrous proteins can relax to elongate muscle fibers or they can contract to shorten them— pulling on tendons and protective tissue to create the force propelling our athlete's body.

节的长纤维蛋白可以放松以拉长纤维，也可以收缩以缩短它们——拉动腱和保护组织以产生推动运动员身体的力量。

Immediately after a muscle fiber is stimulated by a nerve — when calcium ions are flooding into the sarcomeres to pull away those two protein bodyguards of tropomyosin and troponin from the actin — that's called the latent period.

纤维被神经刺激后立即——钙离子涌入节，将动蛋白中保护原球蛋白和钙蛋白的蛋白质带走——这称为潜伏期。