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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.
1 Structural characteristics of skeletal, smooth, and cardiac muscle; striated vs nonstriated. 2  Skeletal muscle = striated, voluntary, shaped like long fibers, multinucleated. 3  Smooth muscle = nonstriated, involuntary, shaped like almonds (tapered ends), one nucleus per cell.