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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.
1 The muscles origin is attached to the immovable bone. 2  At its other end, the insertion is attached to the movable bone.3  Body movement occurs when muscles contract across joints and their insertion moves towards their origin.Angular movements increase or decrease the angle between two bones. The muscles origin is attached to the immovable bone. 2  At its other end, the insertion is attached to the movable bone.