Nernst

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Author:
aphy101
ID:
300712
Filename:
Nernst
Updated:
2015-04-13 18:39:26
Tags:
profmwinston
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Description:
Nernst Ch 10
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  1. ´╗┐What is required for nernst to be reached?
    Unimpeded Flow
  2. What is the nernst voltage for K+?
    -90mv
  3. What is the nernst voltage for Na+?
    +60mv
  4. What is the voltage for resting membrane potential?
    -70mv
  5. What is the voltage for threshold?
    -55mv
  6. If the flow of Na+ into the cell is increased, will the cell be hyperpolarized or hypopolarized? Explain why.
    Hypopolarized because nernst for Na+ is +60 and the voltage will go from -70 (RMP) towards +60, making it less negative than threshold (-55)
  7. If the flow of Na+ into the cell is decreased, will the cell be hyperpolarized or hypopolarized? Explain why.
    Hyperpolarized because nernst for Na+ is +60 and the voltage will go from -70 (RMP) away from +60, making it more negative than threshold (-55)
  8. If the flow of K+ out of the cell is increased, will the cell be hyperpolarized or hypopolarized? Explain why.
    Hyperpolarized because nernst for K+ is -90 and the voltage will go from -70 (RMP) towards -90, making it more negative than threshold (-55)
  9. If the flow of K+ out of the cell is decreased, will the cell be hyperpolarized or hypopolarized? Explain why.
    Hypopolarized because nernst for K+ is -90 and the voltage will go from -70 (RMP) away from -90, making it less negative than threshold (-55)
  10. If the cell membrane becomes hyperpolarized, will the cell become more or less able to reach action potential? Explain why.
    Less able because more negative (from RMP at -70) goes away from threshold (-55)
  11. If the cell membrane becomes hypopolarized, will the cell become more or less able to reach action potential? Explain why.
    More able because less negative (from RMP at -70) goes towards threshold (-55)
  12. What does hyperpolarized mean?
    More negative than threshold (-55)
  13. What does hypopolarized mean?
    Less negative than threshold (-55)
  14. What is the normal concentration of Na+ inside/outside the cell?
    15/150
  15. What is the normal concentration of K+ inside/outside the cell?
    5/145
  16. What is the normal osmolarity for human blood?
    275-295 mosm/kg
  17. What is the equation for computing the value of a concentration gradient?
    (C1-C2)/D

    • C1=Conc. value 1
    • C2=Conc. value 2
    • D=Distance
  18. What is the equation for determining osmolarity?
    S/V=C

    • S=Solute in mosm
    • V=Volume in liters
    • C=Concentration

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