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Unformatted text preview: Chapter 8 Membrane Transport Figures referenced: 1,2,4,6-13, Tables 8-1 and 8-2 Big Picture: Four Ways to Get Across a Membrane Simple Diffusion: DOWN concentration gradient, no proteins involved- solute movement from region of higher concentration to region of lower concentration- relevant means of transport only for small, nonpolar molecules- tends to move toward minimum free energy- diffusion vs. osmosis osmosis involves water moving towards higher concentration solute- a few factors determine diffusion rates across lipid bilayers o smaller molecules have easier time diffusing than larger molecules o nonpolar molecules are permeable and less to polar molecules o bilayer highly impermeable to ionic particles- rate of diffusion proportional to concentration gradient o requires no input of energy, therefore it is always moving with respect to the gradient Facilitated Diffusion: DOWN concentration gradient, uses channels and carrier proteins- Channel proteins form hydrophilic channels through membrane o Allow passage of solutes without major change in conformation of protein...
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