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How the Body Works : Muscles move joints

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Uploaded by on Aug 3, 2007

Muscles move joints

Movement at joints is effected by the action of muscles that are generally arranged in opposing pairs. As one muscle contracts and shortens, the other relaxes and becomes longer. For example, the biceps and triceps. The biceps and triceps control movement of the forearm, the biceps contract and act as the prime mover, while triceps, the antagonist, relaxes. When the elbow is straightened the reverse occurs.

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  • so i can never truly be relaxed

  • @combatsambonyc this is not true, its when you move(retracting your muscles) that you actually use the energy, stop doing anything, or use something to help your harm to stay in place, and you are going to be "relaxing",but im sure you knew that and your just playing smart ass

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  • agonist/antagonist

  • steroidsonline.eu

  • antagonistic muscles

  • yes u can actully.........

  • thanxx =)

  • hahahaha yeah you're right...

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