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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.
The movement accomplished by a muscle when it contracts is called its action. When a muscle contracts it applies a force to one end of a bone which pivots at a joint and lifts a weight (moves a part of the body) at the other end.Although the arrangement of pivot, muscle, and weight may vary, the principle is always the same.he end of a muscle furthest from the dorsal midline, more distal or more movable is called the insertion. As the muscles are described, the origin and insertion will be identified; try not to simply memorize which is which.