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"
Skeletal muscles will have a flexor and an extensor. The flexor bends the joint. The extensor straightens it out again. You need pairs of skeletal muscles because if you didn't have
http://wiki.answers.com/Q/Why_must_skeletal_muscle...
A good example of a pair of muscles working together can be seen in the human arm. Your
http://www.chacha.com/question/how-do-muscle-pairs...
Rhomboids.
http://www.ehow.com/about_5282783_muscles-do-rowin...
One muscle relaxes, allowing the other muscle to contract, therefore the contracting muscle pulls the body into motion.
http://answers.yahoo.com/question/index?qid=200703...
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