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

在个过程中，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，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，意味着有新肌节产生，与之前肌肉平行生长。

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导致了肌节收缩和放松结合和松弛。

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

对于骨骼肌， 增加柔韧来自于额外肌节，可以在更长距离内保持力量。

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

在较小尺度上，些骨骼肌纤维由数百万个肌节组成——肌肉组织最小收缩单位。

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部分，其中包含两股更小蛋白质——两种不同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肌动蛋白链组成，也包含粗丝，由更厚、看起来块状肌球蛋白链组成。

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

肌节增减取决于肌肉频率，因此提高整体柔韧需要全面拉伸方案。

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，条 Z 线只是由以之字形图案交替排列细丝形成边界。

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蛋白质带走——称为潜伏期。