# Nernst

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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

### Card Set Information

 Author: aphy101 ID: 300712 Filename: Nernst Updated: 2015-04-13 22:39:26 Tags: profmwinston Folders: Description: Nernst Ch 10 Show Answers:

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