Lec9 - Membrane Transport II

Lec9 - Membrane Transport II - Lecture 9: Membrane...

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Lecture 9: Membrane Transport II Reading: Chapter 2, pp 67 - 69 Lecture Outline III. Facilitated or Mediated Transport 1. Facilitated diffusion 2. Active transport Primary Active Transport Secondary Active transport 3. Bulk Transport: Endocytosis and Exocytosis
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III. Mediated Transport Systems Molecules that are too large and/or polar to diffuse are transported across plasma membrane by Facilitated / Mediated Transport System. Three kinds: 1. Facilitated Diffusion 1. Active Transport 1. Bulk Transport: Endocytosis and Exocytosis
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Structure of Plasma Membrane
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Diffusion: Movement of molecules down the concentration gradient. No energy required. Facilitated Diffusion: Transport membrane proteins required. No energy required for transport. Movement of molecules down the concentration gradient. Active Transport: Transport membrane proteins required. Energy required. Movement of molecules against the concentration gradient.
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1. Facilitated Diffusion: Membrane proteins facilitate diffusion of some charged molecules across plasma membrane. No energy required for transport. Movement of molecules down their concentration gradient. Membrane Transport Proteins: Channels: Provide corridors for charged molecules to pass through the plasma membranes. Specificity of channels depends on its charge and pore size. e.g., water channels (Aquaporin), ion channels – may be specific or non-specific
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This note was uploaded on 09/12/2010 for the course BIOLOGY 225 taught by Professor Pavgi during the Winter '10 term at University of Michigan.

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Lec9 - Membrane Transport II - Lecture 9: Membrane...

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