move large molecules across membrane down concentration gradient, large molecule attraches to protien it changes shape, releases molecule at opposite end of membrane
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Facilitated diffusion (channel protiens)?
form pores in membrane for charged particles to diffuse through, different channel protiens faciliate different particles.
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Factors effecting the rate of facilitated diffusion?
Concentration gradient, Number of channel/ carrier protiens
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What is osmosis?
Diffusion of water molecules across a partially permeable membrane, from an area of high to low water potential
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Factors affecting the rate of osmosis?
Water potential gradient, Thickness of exchange surface, The surface area of exchange surface
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Active transport description (carrier protiens)?
ATP undergoes hydrolysis reaction, splitting into ADP and Pi.
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Active transport description (co- transporters)?
Type of carrier protien, Bind two molecules, one move, Other against concentration gradient
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Co- transport and aborption of glucose step one?
1. Sodium ions activly transported out of epithelial cell into illeum by sodium potassium pump, Creates concentration gradient
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Co- transport and absoption of glucose steps 2 and 3?
2. Sodium ions diffuse from lumen of ileum into epithelial cell, down concentration gradient, 3. Glucose diffuses out cell into blood by facilitated diffusion
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Other cards in this set
Card 2
Front
Cholesterol structure
Back
Gives membrane stability, cholesterol binds to hydrophobic tails, less fluid more rigid
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