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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.
Most skeletal muscles are arranged at joints, in opposing pairs. The muscle that causes an action is referred to as the prime mover or agonist (= leader). Often another muscle, called the antagonist (ant = against), relaxes while the prime mover contracts.bduction. Movement of a bone, and the limb of which it is a part, away from the mid-line of the body. Verb: To abduct. Abductor. Any muscle that moves one part of the body away from another-or away from the midline of the body. Action. Movement (usually of skin or bone) caused by muscle contractions.