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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.
There are two ends of attachment of skeletal muscle. The origin, and the insertion.   The insertion end refers to the end which is attached to a moveable bone which t â¦ his muscle will move when it is contracted.   The origin end is usually the most distal attachment (in appendicular skeleton) this is the bone that the muscle attaches to, and DOES NOT MOVE.   Example. Biceps brachii.