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When a skeletal muscle contracts to cause a given movement, the more movable end of attachment of the muscle is termed its. origin. insertion. antagonist. synergist. When a muscle contracts, it usually has an opposing muscle that can cause movement in the opposite direction.
This is usually another bone and called the insertion site. When the muscle contracts, the joint between the two attachments acts as a lever and causes motion that moves that part of the body. *copied from a different question to help you out*.