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Question

A muscle can _____


  1. Pull only

  2. Push only

  3. Pull and Push

  4. None of these


Solution

The correct option is A

Pull only


Muscles can only pull and cannot push. This would be a problem if a joint was controlled by just one muscle. As soon as the muscle has contracted and pulled on a bone, that would be it, with no way to move the bone back again. The problem is solved by having muscles in pairs,called antagonistic muscles in opposite directions. 

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