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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.
If the points of attachment of the muscle are not rigidly fixed, the muscle contracts, performing mechanical work. If the points of attachment of the muscle are fixed, tension develops in the muscle. A latent period ensues between the origin of excitation and the appearance of a wave of contraction or tension.