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.
Smooth muscle (Involuntary) 3. Cardiac muscle (Involuntary) Voluntary muscles are those that you can conciously control; for example your biceps. Involuntary muscles are controlled by your subconscious and you have no control over them such as your esophagus or stomache (smooth muscle) or your heart (cardiac muscle) Source: Modern Biology by Holt.