test: friday 11/11 cell transport. cell membrane permeability semi- permeable— allows small...
DESCRIPTION
FLUID MOSAIC MODELTRANSCRIPT
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TEST: FRIDAY 11/11CELL TRANSPORT
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CELL MEMBRANE PERMEABILITY
• Semi-permeable—allows small substances to pass through freely• Larger
substances must pass through channels• Lipid bilayer
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FLUID MOSAIC MODEL
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DIFFUSION
•Molecules always move from HIGH to LOW concentrations•Occurs due to a concentration gradient• Effective only across a small distance
Diffusion/Osmosis Animations
Click the pic to watch the video
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M & M DEMO
1. Take a petri dish and fill it with water2. Place 4 different color M&Ms into the
water3. Observe what happens
• What is this process called?? DIFFUSION!!
• Will all the colors evenly distribute in time?YES!!
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MEMBRANE TRANSPORT• Passive transport—type of simple diffusion• Molecules move from
HIGH to LOW concentration• Osmosis—diffusion of
water• Facilitated diffusion
occurs through protein channels
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SOLUTE CONCENTRATIONS• Isotonic: equal amounts of solutes•Hypotonic: solution has lower solute concentration (H20 IN—cell bursts)•Hypertonic: solution has higher concentration of solutes (H20 OUT—cell shrinks)
Diffusion/Osmosis Animations
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OSMOSIS
•Diffusion of water•Occurs easily through bi-lipid layer
Click pic to watch the video
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FACILITATED DIFFUSION•Molecules pass through or bind to a protein channel to cross a membrane
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FACILITATE DIFFUSION THROUGH CARRIER PROTEINS
• When a substance being transported binds to protein• Moves from HIGH to LOW
Click above to watch a video
showing facilitated diffusion
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