week 4 - Membrane Potential Three Main Factors Membranes...

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Membrane Potential
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Three Main Factors Membranes Fluid Protein
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Membrane Phospholipid Bilayer 2 layers of phosphlipids Hydrophobic: hydrocarbon Hydrophilic: phosphate Function: Isolate the cytoplasm from the extracellular fluid.
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Fluid Cytosol Fluid Extracellular Fluid Components: Solvent: Water H2O Solute: Ions—cations K+ Na+ -- anions Cl- Non-soluble compounds
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Proteins Channel Proteins Transmembrane proteins-forming the pore of the ion channel Diameter, R groups-forming the ion selectivity Changes in the local environment of the membrane-gating Ion Pumps Using ATP.
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Three ways of Ions Transport
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Electrical Force Electrical Potential: The force exerted on a changed particle, reflecting the difference in charge between two sides.
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Membrane Potential The membrane potential is the voltage across the neuronal membrane. Two important forces: Concentration Gradient Electrical Force
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Equilibrium Potential: the electrical potential difference that balances than ionic concentration gradient.
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