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, skeletal muscle, and striated muscle are all muscular tissues. They have differences however, smooth muscle is involuntary and is usually found in the visceral organs (these are stomach, the intestines and the like) of the body; a striated muscle can either be skeletal or cardiac, they are striated because of the presence of certain proteins that constitute them.