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ESS 40 - ESS40 17:42 Chapter3: .

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ESS 40 17:42 Chapter 3: The Plasma membrane and membrane potential The plasma membrane is a bi-layer structure The membrane has a phosphate head and tail with a lipid center The plasma membrane is a fluid lipid bi-later embedded with proteins. Phospholipids form a bi-layer. The bi-later has a hydrophobic interior. This interior is sandwiched between  hydrophilic inner and outer surfaces. Carbohydrates are attached to its outer surface The lipid bi-layer has three functions It forms the basic structure of the membrane Its hydrophobic interior is a barrier to water-soluble substances It allows the membrane to be fluid. Seven Functions of cell membrane proteins Act as channels Carrier molecules Act as transporters of secretory vesicles Membrane bound enzymes Receptor sites Cellular adhesion molecules Outer membrane recognition proteins Role of the Recognition Proteins They comprise something called: The extra-Cellular Matrix= ECM There are three types of porteins Types of Protein fibers in the ECM Collagen cable like fibers hold cells together
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