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Science 4 - Unit 1.3 - Skeletons and movement

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  • What am I? I am a soft part inside your body that pulls on your bones. 我是什么？我是你体内柔软的、拉动骨头的部分。
    A muscle. 肌肉。
  • Fill in the blank: When a muscle ______, it gets longer and looser. 填空：当肌肉______时，它会变长变松。
    Relaxes. 放松。
  • True or False: Muscles work alone and do not need bones. 对还是错：肌肉单独工作，不需要骨头。
    False. 错。
  • When you bend your arm, what happens to the muscle on the top of your arm? 当你弯曲手臂时，手臂上方的肌肉会发生什么？
    It contracts and gets shorter. 它收缩并变短。
  • Why do we need both bones and muscles to move? 为什么我们需要骨头和肌肉一起才能活动？
    Muscles pull on bones to make them move. 肌肉拉动骨头使其移动。
  • What does "relax" mean? "放松"是什么意思？
    To get longer and looser. 变长变松。
  • When you bend your arm, what happens to the muscle on the bottom of your arm? 当你弯曲手臂时，手臂下方的肌肉会发生什么？
    It relaxes and gets longer. 它放松并变长。
  • 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。
  • What does "contract" mean? "收缩"是什么意思？
    To get shorter and tighter. 变短变紧。
  • 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 relaxes? 当肌肉放松时会发生什么？
    It gets longer and looser. 它变长变松。
  • Fill in the blank: When a muscle ______, it gets shorter and tighter. 填空：当肌肉______时，它会变短变紧。
    Contracts. 收缩。
  • 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。
  • How do muscles work? 肌肉如何工作？
    They work in pairs. 它们成对工作。
  • When you straighten your arm, what happens to the muscle on the bottom of your arm? 当你伸直手臂时，手臂下方的肌肉会发生什么？
    It contracts and gets shorter. 它收缩并变短。
  • True or False: Muscles are hard like bones. 对还是错：肌肉像骨头一样坚硬。
    False. 错。
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