Cell Coverings Section 4.7.

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Presentation transcript:

Cell Coverings Section 4.7

Learning Objectives Identify different types of cell coverings Compare and contrast the extracellular matrix and the cell wall

Extracellular Matrix (ECM) ECM = A network of protein fibers & polysaccharides secreted by the cell Main structural component is collagen Connected to the outside of the cell membrane by integrins (a type of receptor protein) Found in animal cells

Function of ECM Protects, supports, & gives shape to the cell Is porous (full of holes) Allows water & solutes to cross to the plasma membrane

Cell Wall Made of proteins & polysaccharides Found in plants, fungi, and bacteria In plants it is made mainly of cellulose In bacteria it is made mainly of peptidoglycan In fungi it is made mainly of chitin

Function of Cell Wall Cements neighboring cells together Protection from disease-causing organisms In plant cells, prevent the cell from exploding due to increased pressure from the central vacuole

Cell Wall In Plants Plants secrete two types of cell walls Primary cell wall Secondary cell wall

Primary Cell Wall Has cellulose in it Is thin & flexible Allows the cell to grow & change shape

Secondary Cell Wall Forms in some types of plant cells Deposited between the plasma membrane & the primary cell wall Is a firm & rigid layer Contains lignin Makes it stronger, waterproof, & protects against plant-attacking organisms Wood is made mainly of secondary cell walls

Secondary Cell Wall