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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. The
muscular system includes three types of muscles. They are smooth, which are
found on the walls of internal organs, cardiac, which is found only in the
heart, and skeletal muscles, which help strengthen the body and connect to
bones. Internet Sites Great pictures of the muscles
in the body. Site
designed by another educator with great ideas. |
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