it14spr201.20Bc8t11-17.txt

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JJLT
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261304
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it14spr201.20Bc8t11-17.txt
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2014-02-10 17:46:41
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profmwinston
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Neurophysiology Sections 11-17
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  1. ´╗┐Resting Membrane Potential.
    -70mV
  2. Spend majority of time in closed state which allows them to regulate movement of ions.
    Gated channels
  3. Gradual difference in concentration of a dissolved substance in a solution between a region of high density and one of lower density.
    Gradient
  4. Inhibits action potentials by increasing the stimulus required to move the membrane potential to the action potential threshold; becomes more negative.
    Hyperpolarization
  5. Moves away from resting membrane potential; becomes less negative.
    Hypopolarization
  6. Chemical element symbol for Potassium.
    K+
  7. Open to release potassium after depolarization.
    K+ gates
  8. Difference in electrical potential between the interior and exterior of a cell.
    Membrane Potential
  9. Chemical element symbol for Sodium.
    Na+
  10. Open when neuron is stimulated allowing Na+ to rush in resulting in depolarization.
    Na+ gates
  11. Period of time a cell is incapable of an action potential; amount of time it takes an excitable membrane to be ready for another stimulus.
    Refractory Period
  12. Electrical potential of a neuron or other excitable cell relative to its surroundings when not stimulated or involved in passage of an impulse.
    Resting Potential
  13. The critical level to which the membrane potential must be depolarized in order to initiate an action potential.
    Threshold
  14. Changes in membrane potential that vary in size.
    Graded Potential
  15. Change of electrical potential associated with the passage of an impulse along the membrane of a muscle cell or nerve cell.
    Action Potential
  16. Phenomenon in which a nerve cell impulses completely when exposed to a threshold stimulus or not at all.
    All or None Response
  17. First location that will reach threshold.
    Axon Hillock
  18. Reversal of the resting potential in excitable cell membranes when stimulated.
    Depolarization
  19. In a multipolar neuron, the first part of axon (initial segment) contains many voltage-gated Na+ channels.
    Trigger Zone
  20. Period immediately following the firing of a nerve fiber when it cannot be stimulated no matter how great a stimulus is applied.
    Absolute Refractory
  21. The period following the firing of a nerve fiber during which initiation of a second action potential is inhibited but not impossible.
    Relative Refractory
  22. Movement of an impulse along the axon.
    Impulse Propagation
  23. Impulse conduction along axon that seems to jump (node to node) on myelinated axon.
    Salutatory Conduction

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