Resting membrane potential Quiz

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1. What are the 3 main factors that produce and maintain the Membrane potential?

Donnan Equilibrium, Membrane selectivity, concentration of ions.
Membrane selectivity, Active transport, Donnan Equilibrium.
Membrane selectivity, Donnan Equilibrium, Excess negative charge.
Active transport, Excess negative charge, concentration of ions.

2. The Nernst equation is used to obtain an accurate value for Em?

TRUE.
FALSE.

3. What is the most imporatnt factor in setting the resting membrane potential?

K+ concentration gradient
Concentration of ion
Na+ permeability
Active transport

4. Using the Nernst equation calculate the Ek+ if the intracellular concentration is 410 mmol/l and the extracellular is 22mmol/l assuming that the temperature is 20oC. What is your answer?

+69
-79
-74
+54

5. What would the units be for the product from the Nernst equation?

mV-millivolts
A-Amps
C-Coulombs
Ion/Sec

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