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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.
These paired striations on skeletal muscles are actually bands of sarcomeres that contract and/or relax during movement. In its simplest explanation, the striations on skeletal muscle are necessary for the muscleâs essential functioning in movement and locomotion.o the striations on skeletal muscles actually perform a vital function for limb and/or joint movements. The bands of stripes have specific tasks to ensure that movement occurs smoothly and as directed by the person involved. But striations are not exclusive to skeletal muscles.