11cells - Lecture 11: Cell Structure and Function Chapter...

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Lecture 11: Cell Structure and Function Chapter 3: Plasma Membrane
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The Big Picture The Plasma Membrane Composition and Functions
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The Plasma Membrane All cells are surrounded by a plasma membrane Marks the boundary Integrity and proper function necessary for life
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Phospholipid Bilayer Like a sandwich Bread: hydrophilic phosphate heads Filling: 2 hydrophobic fatty acid tails
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Proteins Membrane studded with proteins Some inside cell, some outside , some cross bilayer
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Types of Proteins Receptors Read chemical messages ( E.g. hormones) Carrier or channel proteins Help some molecules cross membrane Enzymes Catalyze (speed up) chemical reactions
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Fluid-Mosaic Model Fluid: like olive oil Cholesterol added to “firm up” membrane Mosaic: many different components
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Semi-Permeable Small neutral molecules are always able to cross E.g. oxygen or carbon dioxide Large or charged molecules need help E.g. glucose or sodium ions
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5 Ways to Cross a Membrane 1.) Diffusion 2.) Osmosis 3.) Facilitated Transport 4.) Active Transport 5.) Endo- and Exocytosis
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Diffusion
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11cells - Lecture 11: Cell Structure and Function Chapter...

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