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Microfilaments are commonly known as actin filaments. They are solid rod like structure and are important component in cytoskeleton. They range from 5 to 9 nanometers diameter.

Microfilaments associate with myosin to generate movements, forces and cellular contraction in basic cells. They divide cells into two parts and helps certain types of cells with amoeboid movements.

The first form of actin globular form, G - actin is produced and long polymerized chains, actin filaments are involved with helix to produce F- actin. Microfilaments have two different ends. The polarity alters the growth rate of microfilaments