Potentials

Card Set Information

Author:
pretty4Jesus
ID:
76464
Filename:
Potentials
Updated:
2011-03-31 16:35:36
Tags:
Neuroscience Block
Folders:

Description:
Potentials
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user pretty4Jesus on FreezingBlue Flashcards. What would you like to do?


  1. Capacitance
    • C= Q/V
    • C~ area/thickness
    • Cm= 1uF/cm2= 0.01pF/um2
  2. Current
    • Q=CV..
    • Q/t=I=C(V/t)

    I=gV or I=g(V-Vrest)
  3. time constant
    T= RmCm

    so if more channels-> inc g-> dec R-> dec T= less time of voltage transient (faster)
  4. Myelination
    • Dec C by inc thickness. (10 fold)
    • 1. fewer charges need to change V
    • 2. voltage transient is faster (T-RC)
  5. Ion Gradient: K
    • []out/[]in: 5:140 (1:28)
    • Nernst: -84
  6. Na
    • []out/[]in: 145:5-15 (~15:1)
    • Nerst: +68
  7. Cl-
    • []out/[]in: 110:4-3 (~10:1)
    • Nerst: -58
  8. Ca
    • []out/[]in: 1-2:0.0001 (10,000:1)
    • Nerst: +116
  9. Refractory Period
    Reduced excitability after AP

    • Absolute: no matter how large I, must wait
    • Relative: during which a larger current or duration can stimulate
  10. AP
    • Dramatic inc in g, conductance (40X) produces AP... explaine high gNa during AP
    • During AP, Na follows Nernst trace.
    • AP: 20 to 40 mV, 3-4ms

What would you like to do?

Home > Flashcards > Print Preview