9-1-11Potentials

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

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Unformatted text preview: Resting Membrane Potentials and Action Potentials Resting Membrane Potential + OUT Na Polarized - 70 mV - Cl Concentration Gradient High Low Equilibrium Electrostatic Gradient K+ Na+ Like Repel A- Cl- Electrostatic Gradient Na+ A- Opposites Attract Chloride ion - - 70 mV C=E Cl C E + Sodium ion - 70 mV Na C E Na+ concentration Outside Inside Na+ concentration Outside Impermeable Inside Potassium ion E - 70 mV + C>E C 3:2 Na -K Pump + Out In + K Action Potential +40 0 ­60 Resting potential ­70 ­80 +40 0 ­60 Threshold ­70 ­80 +40 s Voltage-gated 0 channels ­60 ­70 ­80 Na+ +40 s Voltage-gated channels 0 Depol Na+ channels open ­60 ­70 ­80 Na+ +40 Na+ channels close 0 Depol ­60 ­70 ­80 +40 0 K+ channels open ­60 ­70 ­80 +40 Refractory periods 0 Depol Repol ­60 ­70 ­80 Absolute +40 Refractory periods 0 Depol Repol ­60 ­70 ­80 Relative +40 0 Depol Repol ­60 ­70 S-P pump ­80 Action Potentials s Axon hillock Animated Unmyelinated Myelinated Nodes of Ranvier Myelin ...
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This note was uploaded on 09/25/2011 for the course PSYCH 310 taught by Professor Dr.morris during the Spring '11 term at Iowa State.

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

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