These are about 8 nm in diameter and, being the thinnest of the cytoskeletal filaments, are also called microfilaments. (In skeletal muscle fibers they are called thin filaments.) Some functions of actin filaments: 1  form a band just beneath the plasma membrane that.  provides mechanical strength to the cell.
The microfilaments are arranged so that the fibers appear to have stripes (striations) in them. These are also called voluntary muscles.. Smooth muscle is involuntary, and is not under conscious control; the muscles in your digestive system are smooth muscles.The cells are individual and are found in sheets instead of long fibers. (Cardiac muscle has characteristics of both, but are not referred to in the question).here skeletal muscle is voluntary, cardiac muscle is autorhythmic (beats involuntarily; generates its own action potentials). 3. Smooth muscle: refers to the muscles that are controlled involuntarily by the brain, like those attached to the base of hair follicles or in the walls of the gastro-intestinal tract.
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.