membrane transport - oregon state...
TRANSCRIPT
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MembraneTransport
Dr.KevinAhern
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Chemical and Electrical Potential Across a Lipid Bilayer Barrier
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Osmotic Pressure Across a Semipermeable Barrier
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Types of Membrane Proteins
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Three Types of Membrane Protein Ports
Uniport Symport (Synport) Antiport
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No Net Change in Charge Net Change in Charge
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Ion Channels
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Ion Channel Features 1. General Structure 2. Opening 3. Filter 4. Effective Opening Size 5. Door
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Potassium Channel
Closed Open
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Potassium Channel - Top-down View
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Hydration Shell
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Cellular Transport Types
Passive - Purely Diffusion Driven, Follows Concentration Gradient Facilitated - Protein Guided, Follows Concentration Gradient
Active - Protein Guided, Energy Required to Move at Least One Molecule Against Concentration Gradient
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Passive Transport - Purely Diffusion Driven
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Ion Channels vs Transporters
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Facilitated Diffusion
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Active Transport
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Sodium-Potassium ATPase
Higher Na+ outside
Higher K+ inside
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Sodium-Glucose Pump Sodium/Glucose Symport
Secondary Energy Source
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Lactose Permease Lactose/Proton Symport
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Lactose Permease Secondary Energy Source - Protons
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Voltage Change
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Nerve Cell Transmission1. Stimulus 2. Opening of Na+ gates 3. Na+ diffuses into cell 4. Voltage change causes K+ gates to open 5. K+ diffuses out of cell 6. All gates close 7. Wave of voltage changes moves down cell 8. Neurotransmitters move signal across cells 9. Na+ K+ ATPase restores gradients in originating cell
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Stimulus, Na+ gates open
K+ gates open
Na+K+ ATPase acts
Action Potential
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Gates
Gates
Wave of Na+ in, K+ out
Transmission of signal from one cell to another
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Tetrodotoxin From Puffer Fish
Bind Voltage Gated Na+ Channels
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Saxitoxin Shellfish Toxin From Algal Blooms
Sodium Channel Blocker
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