Microfilaments are primarily composed of which protein?

Microfilaments are primarily composed of actin, which is a globular protein that polymerizes to form long, thin filaments. These structures play a crucial role in various cellular functions, including maintaining cell shape, enabling cell movement, and facilitating intracellular transport. Actin microfilaments are part of the cytoskeleton, providing structural support and participating in processes such as muscle contraction and cytokinesis during cell division. The characteristic dynamic nature of actin filaments allows cells to adapt their shape and motility in response to their environment, which is essential for processes like wound healing and immune responses.