Cytoskeleton
# Microfilaments
Size: 7nm Made from: polymers of actin Roles: Give support and mechanical strength, keep cell shape and enable movement
# Intermediate filaments
Size: 10nm Made from: variety of proteins Roles: Anchor nucleus, extend between membranes
# Microtubules
Size: 18-30nm Made from: tubulin Roles: Form tracks for motor proteins (dyein and kinesin) to walk and drag organelles.
Overview in Organelles