Final answer:
The formation and growth of actin filaments at the leading edge of a cell involve the assembly of structures like the lamellipodium and the formation of pseudopodia. These processes contribute to cell motion and extension.
Step-by-step explanation:
The formation and growth of actin filaments at the leading edge of a cell involves several processes. At the leading edge, actin filaments assemble to form a structure called the lamellipodium. The lamellipodium grows through processes like filament polymerization, branching, capping, and crosslinking. This dynamic growth of actin filaments allows the cell to extend and create temporary extensions called pseudopodia, which contribute to cell motility.