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Article: How does a muscle expand?(Ask Doctor Cory)
- Article from:
- Children's Playmate
- Article date:
- March 1, 1996
- Author:
CopyrightCOPYRIGHT 1996 Benjamin Franklin Literary & Medical Society, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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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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