Three types of Cytoskeleton 254m 254m 25m INTERMEDIATE FILAMENTS MICROTUBULES ACTIN FILAMENTS P您p0n般畅 25m Intermediate lilaments are ropelike fibers with 25 nm a diameter of about 10 nm;they are made of 25 nm Actin filamants (also known as microfilaments) intermediate filament proteins,which Microtubules are long,hollow cylinders made are helical polymers of the protein actin.They constitute a large and heterogeneous family of the protein tubulin.With an outer diameter appear as flexible structures,with a diameter of One type of intermediate filament forms a meshwork called the nuclear lamina just of 25 nm,they are more rigid than actin about 7 nm,that are organized into a variety of beneath the inner nuclear mombrane.Other filaments or intermediate filaments.Micro- linear bundles,two-dimensional networks,and types extend across the cytoplasm,giving cells tubules are long and straight and typically have three-dimensional gels.Although actin mechanical strength and carrying the one end attached to a single microtubule- filaments are dispersed throughout the cell, mechanical stresses in an epithelial tissue by organizing center called a centrosome,as they are most highly concentrated in the cortex, spanning the cytoplasm from one cell-cell shown here. iust beneath the plasma membrane. junction to another. This document is produced by trial version of Print2Flash.Visit www.print2flash.com for more information