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9-1-11Potentials - Resting Membrane Potentials and Action...

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Resting Membrane Potentials and Action Potentials
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OUT Na + Cl - Polarized - 70 mV - + Resting Membrane Potential
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Concentration Gradient High Low
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Equilibrium
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Electrostatic Gradient Na + K + Like Repel A - Cl -
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Electrostatic Gradient Na + A - Opposites Attract
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Chloride ion C E - 70 mV C = E Cl -
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Sodium ion - 70 mV C E Na +
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Na+ concentration Outside Inside
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Outside Inside Na+ concentration Impermeable
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Potassium ion - 70 mV C E C > E +
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Na -K Pump 3 : 2 K + + Out In
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Action Potential
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-70 -60 0 +40 -80 Resting potential
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-70 -60 0 +40 -80 Threshold
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-70 -60 0 +40 -80 Voltage-gated Na
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