How does a muscle expand?(Ask Doctor Cory)

Children's Playmate | March 1, 1996| | Copyright

Dear Dr. Cory:

How does a muscle expand?

Matthew Yetter

Colorado Springs, Colorado

Dear Matthew:

A muscle expands when it relaxes. The muscles in our bodies are attached to bones. They help the bones move, much like strings help a puppet move. But muscles can pull in only one direction. They cannot push. Each bone is usually attached to a pair of muscles. While one muscle pulls and contracts (shortens), its partner relaxes and expands (lengthens).

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