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Neurons fire in the brain via electrical impulses through the nervous system to trigger specific muscles to contract or relax. These muscles are attached to the bones of a skeleton with ligaments that pull or push the bone in one direction or another in relation to the skeleton as a whole, if the muscle that contracts and relaxes is attached to a bone that remains stationary during the contraction or relaxation, the rest of the skeleton would move in the opposite direction of the contraction or relaxtion depending on the joints and the relationship of that joint to the muscle contracted or relaxed, thus allowing the skeleton to "move."

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15y ago

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