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MOVING AND
GROWING
QCA Unit number 4A
WHAT'S THE BIG IDEA?
Some animals have a
backbone. Some do not. Animals with backbones are called
vertebrates - backboned animals. Backboned animals have a hard body
frame inside them - their skeleton.
Fish, amphibians, reptiles, birds and mammals have a skeleton. You
are a mammal. You have a bony skeleton. Your skeleton grows with
you.
Your skeleton:
- supports your body and gives it
shape.
- protects the soft and squashy bits of
you.
- has muscles attached to it.
Muscles are able to contract and relax.
When they contract, they pull on your skeleton. You move.
Muscles work in pairs. One contracts to lift your arm. Another
contracts to lower it. When you exercise, your muscles work
hard.
Did you know?
Muscles cannot push, they can only pull. So
if you want to move your arm from side to side, you need a pair of
pulling muscles, working together, to do it!
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