What role do microfilaments play in a cell?

Microfilaments are a key component of the cytoskeleton, which is a network of fibers that provides structural support to the cell, much like a scaffolding does for a building. These thin, flexible fibers are composed mainly of the protein actin and play several roles within the cell.

By providing structure, microfilaments help maintain the shape of the cell and assist in the movement of the cell's components. They are involved in various cellular processes, including the contraction of muscle cells, cell division through the formation of the cleavage furrow during cytokinesis, and cell motility. While microfilaments contribute to these processes, their primary defining feature is their structural role in the cytoskeleton. Thus, the significance of microfilaments is highlighted by their essential function in maintaining the integrity and shape of the cell, which is accurately represented by the correct answer.