Why Do Muscles Work in Pairs?

Answer

Muscles normally work together so as to facilitate contraction and relaxation. Generally, when one muscle moves a bone one way, then the other muscles moves it the opposite way because muscles have the ability to pull only in one direction.
Q&A Related to "Why Do Muscles Work in Pairs"
Because a muscle can only contract (pull) to exert its force, so to be able to move in both directions there has to be another muscle whose pull will cause the first muscle to stretch
http://wiki.answers.com/Q/Why_do_voluntary_muscles...
Some muscles, like the muscles in your heart and digestive system, are involuntary. They work by themselves without you consciously telling them to do anything. Other muscles are
http://www.ehow.com/how-does_4674388_muscles-work....
Because skeletal muscles can contract on their own, but they cannot extend on their own. For that reason, one muscle contracts. and the other extends due to the other contracting.
http://answers.yahoo.com/question/index?qid=200904...
Antagonistic pairs are needed b/c muscles can only exert a pulling force, &
http://www.chacha.com/question/why-do-muscles-wrk-...
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