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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.
Distinguish between the origin and insertion of a muscle. One end of a skeletal muscle is usually fastened to a relatively immoveable or fixed part on one side of a joint called the origin of the muscle. The other end of the muscle is connected to a moveable part on the other side of that joint called its insertion.