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

在这个过程中，它会收缩整个肌节，收缩肌肉。

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

肌肉收缩就是肌节收缩，使这些 Z 线更靠近。

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，这意味着有新肌节产生，与之前的肌肉平行生长。

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肌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.

对于骨骼肌， 增加的柔韧性来自于额外的肌节，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，这些骨骼肌纤维由数百万个肌节组成——肌肉组织的最小收缩单位。

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。

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。

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

肌节的增减取决于肌肉的使用频率，因此提高整体柔韧性需要全面的拉伸方案。

Each sarcomere is separated by what's known as a Z line at either end, which is just a border formed by alternating thin filaments in a kind of zig zag pattern.

每个肌节在两端都被一条 Z 线分开，这条 Z 线只是由以之字形图案交替排列的细丝形成的边界。

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.

肌肉纤维被神经刺激后立即——钙离子涌入肌节，将肌动蛋白中保护原肌球蛋白和肌钙蛋白的蛋白质带走——这称为潜伏期。