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.
Muscle tissue varies with function and location in the body. In mammals the three types are: skeletal or striated muscle; smooth or non-striated muscle; and cardiac muscle, which is sometimes known as semi-striated.n vertebrates, there is a third muscle tissue recognized: 1  Cardiac muscle (myocardium), found only in the heart, is a striated muscle similar in structure to skeletal muscle but not subject to voluntary control.
Contractions in striated muscles are voluntary, except for the heart muscle, in which contractions are involuntary. Cardiac muscle is often treated separately from the other striated muscles, as it has somewhat different characteristics. A sarcomere is the functional unit of striated muscles.triated muscle tissue is muscle tissue that has repeating sarcomeres, in contrast with smooth muscle tissue. Specifically, striated muscles are: 1  Pharyngeal muscle (embryologically different from skeletal muscle).