James's+Cell+Wall

media type="youtube" key="bVQf7L9CgDM" height="315" width="420" align="right"Cell Wall

 * **Plant cells have a rigid, protective cell wall.**
 * **Fluid collects in the plant cell vacuole and pushes out against the cell wall.**
 * **Cell walls are made of cellulose.**
 * **Mature cells add substances to the primary cell wall for additional strength or to make it waterproof. This is the secondary cell wall.**
 * **The fibers of cell walls are laid down in different directions to add strength.**
 * **Cell walls contain other substances making a tough matrix. There is a "glue"** **between the cell walls of adjacent cells.**
 * **Cell walls work with the vacuole to make a cell turgid and to help support the plant.**
 * **The cell wall (found only in plant cells) protects the plant cell, maintains its shape, and prevents excessive uptake of water.**
 * ** The secondary wall, often deposited in several laminated layers, has a strong and durable matrix that affords the cell protection and support. **
 * **Other cells add a secondary cell wall between the plasma membrane and the primary wall.**
 * **When the cell matures and stops growing, it strengthens its wall.**
 * **A young plant first secretes a relatively thin and flexible wall come**
 * **Some plant cells do this simply by secreting hardening substances into the primary wall.**
 * **On the whole, each cell's cell wall interacts with it's neighbors to form a tightly bound plant structure.**
 * **Despite the rigidity of the cell wall, chemical signals and cellular excretions are allowed to pass between cells.**
 * [[image:http://library.thinkquest.org/C004535/media/cell_wall.gif width="253" height="325"]]



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