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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.
Ends: A typical skeletal muscle consists of two ends. These are; 1  Origin is one end of the muscle which remains fixed during its contraction. 2  Insertion is the other end which moves during its contraction. 3  In the limb muscles, the origin is usually proximal to insertion.arts: A typical skeletal muscle consists of two parts. These are; 1  Fleshy part is contractile, and is called the âbellyâ. 2  Fibrous part is non-contractile and inelastic. 3  When cord-like or rope-like, it is called tendon; when flattened, it is called aponeurosis.