Chpt 12. transport of solutes across a membrane

Chpt 12. transport of solutes across a membrane - Transport...

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Transport of Solutes Across Membranes (Ch. 12) Simple Diffusion Facilitated Diffusion (Protein-mediated) Carriers vs channels Active Transport (Protein-mediated) energetics/ electrochemical gradients Coordination of transport processes Neuromuscular junction: how we move Intestinal epithelium: how we eat Stereocilia of the inner ear: how we hear
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Overview of transport mechanisms: 12-4
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Simple diffusion Nonpolar molecules (and small polar mol.) dissolved gases, steroid hormones, fatty acids Movement across bilayer from High-to- Low concentration until equilibrium is reached Water (Osmosis)
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Water movement 12-16,-17
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Facilitated diffusion (Passive transport) Types of molecules Movement “DOWN” concentration gradient until equilibrium is reached. Protein mediated Carriers bind to solute Channels form aqueous pore (GATED!)
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Types of molecules: all solutes not able to diffuse across lipid bilayer 12-5
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Two types of transporters: Carriers and Channels 12-3
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Regulated by three mechanisms (12-24)
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This note was uploaded on 04/10/2011 for the course BIOL 3510 taught by Professor Chapman during the Spring '08 term at North Texas.

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Chpt 12. transport of solutes across a membrane - Transport...

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