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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.
Skeletal muscles move the bones of the body. The functional unit of skeletal muscle is a sarcomere, which consists of thick filaments, called myosin, and thin filaments, called actin. The action of the actin and myosin fibers sliding past one another causes the muscle to contract. The neuromuscular junction is where the nerve cell meets the muscle.