Chapter 10:Topics 11-14

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Electrical voltage due to movement of ions across a membrane

Nernst Equilibrium (NE)
The NE for NA+ is:

+60mv
The NE for K+ is:

-90mv
For the Nernst to be reached there must be

Unrestricted flow
If the flow of an ion is _____, the membrane voltage will _____ _____ from its Nernst

Reduced; go away
If the flow of an ion is _______, the membrane voltage will ______ _______ its Nernst

Increased; go towards
Essential in maintaing the electrochemical gradient across the cell membrane

Na/k Pump
Na+

Sodium; +60mv
K+

Potassium; -90mv
Transports sodium ions out of the cell and potassium ions into the cell

Na/K Pump
Resting Potential (RMP) is:

-70mv
Threshold is:

-55mv
If the membrane becomes more negative than the resting potential then it is:

Hyperpolarized
If the membrane become more positive than it is:

Hypopolarized
If the threshold is reached, an ______ ______ results.

Action Potential