Which cytoskeletal element is composed largely of actin and is crucial for cell mobility?

Microfilaments, which are primarily composed of actin, play a vital role in cell mobility. They are part of the cytoskeleton, providing structural support and shape to the cell while also facilitating movement. Actin polymerizes to form long, thin filaments that can rapidly assemble and disassemble to drive processes such as muscle contraction, amoeboid movement, and the formation of cellular structures like microvilli.

This dynamic capability allows cells to change shape and move effectively in response to their environment, making microfilaments crucial for various cellular activities, including migration, division, and changes in the overall cell shape. Their role in motility is essential for processes like wound healing and immune response, where cells need to migrate toward areas of injury or infection.