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JUST FOR KIDS
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IMCPL Kids' Info Guide: Muscular System
You may also be interested in these Info Guides:
The Bundles of Energy

Science Factfile
- Muscles are bundles of cells and fibers.
- Muscles work in a very simple way. All they do is tighten up--that is, contract--and relax.
- You have two sets of muscles attached to many of your bones which allow them to move.
- There are 630 active muscles in your body and they act in groups.
- Muscles can only pull. They never push.
Websites
- Your Multitalented Muscles
- Human Body Adventure: Muscular System
- Your Gross and Cool Body: Muscular System
Library Materials
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