A&P 1 exam 3 (part 5)

Card Set Information

A&P 1 exam 3 (part 5)
2014-11-09 15:17:42
anatomy physiology fall nervous system

Nervous System: Action Potential Nervous System: Ionic Basis of Action Potentials Fall 2014
Show Answers:

  1. action potential aka
    nervous impulse
  2. can be any change capable of getting a response
    response to stimulus
  3. ex of stimulus responses?
    • chemical
    • temperature
    • mechanical
    • light
  4. uses a monitor to display results using time and voltage
  5. action potential is limited to specific time therefore is cannot equal
  6. when voltage doesn't change over time
    resting membrane potential
  7. Resting membrane potential is a characteristic of
    all cells that are alive
  8. RMP gives you a ____, which others are deviated from that
  9. ways to verify if it is in fact an action potential
    electrical charges in Vm with stimulus
  10. skeletal only move with action potential
  11. in a resting cell, the muscle has?
    no contraction, which tells neuron there is no action potential
  12. when you apply weak stimuls?
    RMP goes from resting to action potential but doesn't last long and goes back to RMP
  13. if muscle fibers do not move, then that means
    no contraction and it is not an action potential
  14. when you apply a strong stimulus?
    muscle contracts and therefore it has an action potential
  15. due to a stronger stimulus, you get
    a greater change in membrane potential
  16. line that is crossed to the point of initial change
    threshold value
  17. when you reach threshold that means?
    action potential
  18. doesn't reach threshold?
    no action potential
  19. all or nothing response
    action potential
  20. once you've seen one __ ___, you've seen them all
    action potential
  21. rise towards positivity
    depolarizing the membrane
  22. fall back towards negativity
    repolarizing the membrane
  23. basis of neural communication
    action potential
  24. action potential requires what to be stimulated
    minimum stimulus strength
  25. come into play during action potential
    sodium and potassium ions
  26. initial _____ depends on if stimulus is strong vs weak
  27. if you hit threshold, ___ channels with being to open
  28. influx of sodium =
  29. when sodium floods in to inside, it makes inside of cell more
    positive OR less negative
  30. at resting, membrane is
  31. depolarization of membrane is from
    influx of sodium ions
  32. at peak, depolarization stops suddenly and sodium channels?
    shut down and postassium channels open
  33. at peak ____ closes and ____ opens
    • sodium
    • potassium
  34. floods to outside by being pushed by concentration and electrical gradient
  35. caused by efflux of potassium
    repolarization of membrane
  36. caused by influx of sodium
    depolarization of membrane
  37. when potassium closes, what is restored
    resting membrane potential
  38. when RMP is restored what is different?
    • distribution of ions
    • (most potassium on outside and more sodium on inside)
  39. how to correct chemical gradients?
    using a sodium potassium pump
  40. only expend energy when using a
    sodium potassium pump
  41. when using sodum potassium pump, membrane is
  42. prohibits from overlapping action potentials
    refractory membrane
  43. characteristics of action potential?
    • requires threshold stimulus
    • all or none response
    • brief duration
    • refractory period
    • found in specific location
  44. duration of action potentials?
    1 milisec to 5 milisec
  45. action potential impulse must be
    transmitted along the membrane by froming adjacent to one another
  46. transmission of action potential includes
    self propogation
  47. sodium channels are open
  48. no channels are open
    peak depolarization
  49. potassium channels are open