lecture 2 - 3. Membrane Transport Complex structure of...

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-1 3. Membrane Transport Complex structure of membranes makes them selectively permeable Cellular fluids have dissolved solutes which are unequally distributed across membranes
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-2 + + + + + - - - - - + Diffusion: Electrical gradients Mechanisms of solute movement across membranes: a. Passive transport: diffusion Diffusion: Chemical gradients
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-3 Pathways of diffusion Directly through lipid bilayer gases, lipids, solvents
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-4 Or facilitated by integral proteins Carrier proteins transport molecules recognizes solute, e.g., glucose, amino acids
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-5 Channel proteins : smaller solutes pass through pore e.g., ions can be gated
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-6 Osmosis: diffusion of water directly through membrane through water channels: aquaporins
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-7 Osmolarity : total solute concentration of a solution Water moves by osmosis from dilute solution to concentrated solution Solutes move by diffusion from high to low concentration
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-8 Tonicity: ability of a solution to impact cell volume Hypertonic : solution pulls water out of cells Hypotonic
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This note was uploaded on 12/07/2011 for the course BICH 412 taught by Professor Miles during the Fall '09 term at Texas A&M.

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lecture 2 - 3. Membrane Transport Complex structure of...

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