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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.
Types of Muscle Tissue. Skeletal muscle is associated with the bony skeleton, and consists of large cells that bear striations and are controlled voluntarily. Cardiac muscle occurs only in the heart, and consists of small cells that are striated and under involuntary control.Smooth muscle is found in the walls of hollow organs, and consists of small elongated cells that are not striated and are under involuntary control. Special Characteristics of Muscle Tissue.Excitability, or irritability, is the ability to receive and respond to a stimulus.ypes of Muscle Tissue. Skeletal muscle is associated with the bony skeleton, and consists of large cells that bear striations and are controlled voluntarily. Cardiac muscle occurs only in the heart, and consists of small cells that are striated and under involuntary control.