Answer :
Ones nervous system (brain and nerves) sends a signal to ones skeletal (voluntary) muscles to activate. In response to the message, ones muscle fibers contract (tense up). When the muscle contracts or constricts, it drags on the tendon. Tendons connect muscles to bones.
Muscles are connected to the skeleton and function supposing that the skeleton is present - for example, there is no muscle that prevents you from bending the middle of your arm because it is stable due to the presence of a bone. The skeleton is essentially a framework for the muscles.
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