Microfilaments, also known as actin filaments, are the thinnest filaments of the cytoskeleton, with a diameter of about 7 nm. They are primarily composed of actin, a globular protein that polymerizes to form long, thin fibers. These filaments are highly dynamic and can rapidly assemble and disassemble, which is essential for various cellular activities. Microfilaments are involved in cell movement, shape maintenance, and the formation of cellular extensions like microvilli.
