The document discusses the cytoskeleton, which is made up of microtubules, intermediate filaments, and microfilaments. Microtubules provide structure to cilia and flagella. Intermediate filaments help maintain the cell's shape. Microfilaments are made of actin and are involved in muscle cell contraction, extending pseudopodia, and cytoplasmic streaming in plant cells. Myosin interacts with actin to generate movement and contraction within cells.

1. Cellular Structural Support

9. Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings

11. Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings Fig. 7.22 In animal cells, the centrosome has a pair of centrioles , consisting of microtubules arranged in a ring. During cell division the centrioles replicate.