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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 point of attachment of a muscle to the immovable, or less movable, bone is called the origin. -Flexion is a movement that generally occurs in the sagittal plane and decreases the angle of the joint, bringing the two bones closer together. -Abduction is movement away from the body, which occurs in the coronal plane.