Microfilaments

The microfilaments  (It is also called  as actin filaments) which contain diameter  5-9 nm, have a mechanically  supportive  function,  finding  the  shape  of the  cell's  surface and they are involved in total cell movement. Microfilaments  are two-stranded helical  polymers  of the protein  actin which  appear  like flexible  structures  organized  into a variety  of linear  bundles  and more  extensive  networks.  Through the their  interaction  with  myosin,  the  microfilaments   form  contractile  assemblies that  are  involved   in  numerous   intracellular   movements   like  cytoplasmic streaming and the formation of membrane invaginations.