Origins of Membrane Potentials:

Question 1

What is the Membrane Potential?

Answer 1

-Difference in charges across the membrane of (ECF) and (ICF)

Question 2

What is the usual Resting Membrane Potential?

Answer 2

-70mV

Question 3

What is the symbol of Resting Membrane Potential?

Answer 3

Em

Question 4

When is there a membrane and potential and when is there not?

Answer 4

• Is Em= Unequal distribution of positive and negative ions

- No- Equal no. positive and negative ions across membrane

Question 5

How are Sodium and Potassium Ions moved usually across the membrane?

Answer 5

• Sodium-Potassium Pump

- But when action potential (VGIC) open for Sodium and Potassium

Question 6

What is Equilibrium Potential?

Answer 6

-When X2 opposing forces equal each other

Question 7

Name X2 forces act on Sodium and Potassium Movement

Answer 7

• Concentration Gradient

- Electrochemical Gradient

Question 8

What is the Equilibrium Potential for Sodium?

Answer 8

• Ena

- +60mV

Question 9

What is the Equilibrium Potential for Potassium?

Answer 9

• Ek

- -90mV

Question 10

Why is the Resting Membrane Potential -83 and not -30mV?

Answer 10

-Because has greater permeability potassium

Question 11

What equation is used to calculate the Equilibrium Potential?

Answer 11

-Nernst Equation

Question 12

What equation is used to calculate the Membrane Potential?

Answer 12

Goldman-Hodgin-Katz Equation