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The A and I bands repeat along the length of the muscle fibers to create the striations visible under the light microscope. 1  Sarcomeres repeat along skeletal and cardiac fibers. 2  Components between adjacent Z-lines comprise the sarcomere. 3  Sarcomeres are considered the functional units of striated muscles.n views of this muscle type, striations are not as strong as those of skeletal muscle. Other structural features are usually apparent and of use for identification if the striations are weak. Due to constant activity cardiac muscle has a constant need for oxygen and glucose delivery.
Each somitic area (occipital, cervical, thoracic, lumbar and sacral) contributes to the formation of muscles. Muscle satellite cells are formed during embryonic development as well, and persist in a quiescent state in the adult muscles, ensuring restoration of muscle cells following any type of muscle injury.natomical Structure and Function of the Skeletal Muscle: Skeletal muscle, also called striated muscle, is a dense, fibrous contractile tissue which exists throughout the entire body, and functions to allow body movement by applying force to bones and joints, via contraction.