9.25_Membrane_transport - Membrane transport Movement...

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Membrane transport Movement depends on: -molecular size (smaller = easier) -molecular charge (polar= harder) -concentration gradients (direction of flow) ( High low) -electrochemical gradients (direction of flow and membrane potential) -protein channels (regulate transport) Diffusion: -movement of particles from an area of high concentration to low concentration -depends on: -Permeability-direct relationship -Surface area of interface- direct relationship -Concentration gradient- direct relationship -Distance- inverse relationship Three ways to get into cell: 1) Simple diffusion 2) Facilitated diffusion 3) Active transport Simple diffusion: -movement down concentration gradient -small, lipophilic molecules can pass between membrane lipids (eg. Ammonia, CO2) -No energy cost -Keys are H2O and O2- both diffuse -What problems does this cause? It’s important because you want to store them but you can’t. Facilitated diffusion:
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9.25_Membrane_transport - Membrane transport Movement...

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