四头肌肌肉让你的膝进入完全的延长。

The quadriceps muscle brings your knee into full extension.

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由于多余的平滑肌肌肉收缩时使气道狭窄从而产生麻烦。

Excess smooth muscle causes problems because when it contracts it Narrows the airways.

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这意味着：他们用眼睛微笑(面部上睑提肌肌肉的收缩)，而不仅仅是他们的嘴。

And they mean it: they smile with their eyes (a contraction of the orbicularis oculi facial muscles), not just their mouths.

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The cells that take an electrical signal, which is coming down your nerve and convert it into a muscle contraction work this way, so 'neuro' nerve, muscle junctions act based on ligand-gated ion channels.

依靠相同的工作原理,细胞将来自于神经的,电信号传递到细胞收缩肌中,所以神经和肌肉关节运动,都基于配体门控离子通道

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