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1.7 Moving Your Bones (Collins Science 4)

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  • When you lift your leg, are your muscles working alone or in a system?
    In a system.
  • What are the muscles around our skeleton attached to?
    The bones.
  • If a muscle is "relaxing," does it get longer or shorter?
    Longer.
  • True or False: Muscles can push bones.
    False (They can only pull).
  • What happens to the muscle at the back of the arm when you straighten it?
    It contracts (gets fatter).
  • Muscles have to ______ to make a bone move.
    Shorten (or pull).
  • Where are the muscles located that move your lower arm?
    The upper arm.
  • Why do muscles need to work in pairs?
    Because they can only pull, not push.
  • Describe a contracting muscle in three words.
    Fatter, harder, and shorter.
  • When a muscle gets shorter, what is it doing?
    Contracting.
  • Which "Key Word" means the opposite of contract?
    Relax.
  • When you bend your arm, does the front muscle contract or relax?
    It contracts (gets shorter/fatter).
  • Is the elbow a bone or a joint?
    A joint.
  • How many sets of muscles control the elbow?
    Two (front and back).
  • What is the main job of the skeleton and muscles together?
    To allow us to move.
  • When you straighten your arm, what happens to the lower arm?
    It moves down.
  • Look at the picture: Is the person holding a flower or a weight?
    A weight (dumbbell).
  • Describe a relaxing muscle in three words.
    Thinner, softer, and longer.
  • What two things work together so you can move?
    Skeleton and muscles.
  • What happens to the muscle at the back of the arm when you bend it?
    It relaxes (gets thinner).
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