Science 4 - Unit 1.3 - Skeletons and movement

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What do muscles do? 肌肉做什么？

They pull on your bones to make them move. 它们拉动你的骨头使其移动。

What are muscles? 什么是肌肉？

The soft parts inside your body that pull on your bones. 你体内柔软的、拉动骨头的部分。

What happens when a muscle contracts? 当肌肉收缩时会发生什么？

It gets shorter and tighter. 它变短变紧。

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