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Membrane Transport - The Cell as the Fundamental Unit of...

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The Cell as the The Cell as the Fundamental Unit of Fundamental Unit of Life: Life: Membrane Membrane Transport Processes Transport Processes
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Selectively permeable- allows certain substances to pass through By 2 ways: active or passive transport Passive - downhill Active - uphill (needs energy) Plasma Membrane Function: Plasma Membrane Function:
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Passive: downhill reaction Simple diffusion Osmosis Facilitated diffusion Filtration Active: uphill reaction, needs ATP Exocytosis Endocytosis - Pinocytosis - Phagosytosis
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No Barrier: Substances “spread out” High concentration to low concentration e.g.: Red dye placed in glass of water Passive Diffusion
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Substances diffuse High concentration to low concentration Pores in membrane must be large “Down the concentration gradient” Dynamic equilibrium, equal rates in both directions Passive Diffusion Biological membrane:
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Facilitated Diffusion Carrier proteins: Bind specific molecule & change shape Pass molecule through middle of protein
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