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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.
Their major function is to give strength to the body and support it; they also produce movements. There are three major categories of muscles; Skeletal muscles Cardiac muscles, and Smooth muscles. These muscles are made up of muscular fibers. Muscle fibers are of two kinds: striated muscle fibers and non-striated muscle fibers. Muscles that contain striated muscle fibers are called striated muscle and muscles that contain non-striated muscle fibers are called non-striated muscles. The difference between striated and non-striated muscles is that in striated muscles, the contractile fibrils are aligned parallel, and their regions form stripes that are easily visible under a microscope, whereas non-striated muscles do not have stripes on them, they give a poor appearance under the microscope.