Your skeleton does not actually produce movement. That is the job of your muscles. When they contract they pull on bones which are joined together by joints. The joints function much the same as a fulcrum and produce three different types of levers depending on where the muscles attach. The most stable attachment is called the origin, and the more movable one is called the insertion. It is the bone that has the insertion end of the muscle that we are familiar with as the bone that moves.
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