Flashcards
Exam 3: Resting Membrane Potential
Flashcards do conjunto (21)
- 1Leak Channelsmostly potassium leakage channels
non gated - 2Voltage Gated ChannelsChannels that open with a change in voltage
- 3Chemically Gated Ion Channelschannels that open when a chemical binds to them (ligand)
- 4Sodium-Potassium ATPasePumps that kick
2K in
3Na out - 5Membrane Potentialthe difference in charge between the inside and outside of the cell
- 6Resting membrane potential (volts)-70mV
- 7Chemical Gradientthe difference in the amount of chemicals on one side of the membrane compared to the other side
ions will diffuse passively from an area of higher chemical concentration to an area of lower chemical concentration - 8Electrical Gradientthe difference in charge across a membrane
ions will move to an area of opposite electrical charge - 9Electrochemical gradientthe driving force
Na+ has the STRONGEST driving force - 10Permeabilitythe ability to have something pass from one side of the membrane to the other
- 11Voltage (V)the measure of potential energy
the dam barrier - 12Current (I)the flow of electrical charge
the water - 13Resistance (R)hinderance of charge flow of which currents must pass
the pipe you can open and close - 14Potential Energyenergy created with the separation of charges
- 15Ohm's LawI = V/R
Current directly proportional to V
Current indirectly proportional to R - 16Resting Membrane Potentialmore sodium out
more potassium in
more positive out
more negative in
-70mV on inside of cell
the movement of ions across creates a polarization (difference in charge), establishing the RMP - 17Equilibrium Potentialthe membrane potential for an ion at which the sum of the forces pushing an ion out of the cell is equal to the forces pushing the ion into the cell
- 18(CQ) If you replace all K+ leakage channels will Cl- leakage channels, RMP becomes ___ negativeless negative!
- 19Depolarization- inside of the cell becomes more positive than RMP
-**Caused my movement of Na+ into neuron! Sodium rushes in and causes this depolarization
- occurs when gated channels open - 20HyperpolarizationInside of the cell becomes more negative than RMP
opening of gated K+ channels or Cl- channels - 21—
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- college Sophomore (1 Semester) (ANPS) FlashCards sobre Exam 3: Resting Membrane Potential, criado por Tessia D em 07-11-2015.
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- Tessia D
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