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Plasma Membrane - Two Basic Types of Cells Plasma Membrane...

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Two Basic Types of Cells Plasma Membrane * Composed of two parallel rows of phospholipids called a phospholipid bilayer. * Contains two types of membrane proteins * integral- penetrate through the membrane * form channels that have pores through which certain substances move in and out of the cell. * transporters (carriers) that move substances from one side of the membrane to the other. * Receptors (recognition sites) which identify and attach various molecules (i.e. hormones, antibodies. . etc.). * cell identity markers-glycoproteins and glycolipids that enable the cell to recognize self and foreign. * peripheral - loosely attached to the exterior or interior surface of the membrane Functions of the Plasma Membrane * Shape and protection Functions of the Plasma Membrane * Communication- occurs via receptors and second messengers * Enzymes in the membrane break down signaling molecules to halt action Signal Transduction Pathway (Second Messenger) Functions of the Plasma Membrane * Maintains the electrochemical Gradient
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