Structures for Support and Locomotion!! • Years ago, scientists thought cell organelles just floated around within the cytoplasm. Recently, scientists have discovered that there are tiny rods and filaments that can move and change to form a framework for supporting organelles. • These tiny filaments and rods are composed of microtubules and microfilaments. • Microtubules are thin and hollow. • Microfilaments are thin and solid. Cytoskeleton Function of the Cytoskeleton • The cytoskeleton provides strength, structure and support; it also maintains cell shape, and aids movement of organelles and intracellular materials. • Color the cytoskeleton now! How do cells move? • Cells move in two ways!! • By the use of cilia or flagella. Cilia • Cilia are short, numerous, hair-like projections from the plasma membrane. They move in a “wave” motion. • The cilia move the cell by beating rhythmically. Flagella • Flagella function to move the cell by one long projection that moves in a whip-like motion. Cells that have flagella will only have one or two projections. Sperm cells Can you guess how each of these cells move? Cell A Cilia Cell B Flagella • Color the cilia or flagella now! • (If they are not present, draw them onto your cell coloring)