BMS03-1014 Membrane Potentials

Question 1

What is the equilibrium potential for an ion?

Answer 1

The membrane voltage a cell needs to stop movement of an ion down its concentration gradient

Question 2

What is K equilibrium potential?

Answer 2

-90

Question 3

What is Na equilibrium potential?

Answer 3

+60

Question 4

Why is the resting membrane potential more similar to K equilibrium potential?

Answer 4

The membrane is much more permeable to K than Na

Question 5

What does a constant resting membrane potential indicate?

Answer 5

Passive leak of K out is the same as the passive leak of Na in

Question 6

How do you calculate the driving force of an ion?

Answer 6

Vm - Eeq

Question 7

What does a high conductance indicate?

Answer 7

Lots of channels open

Question 8

What does the Hodgkin equation consider that the Nernst doesn’t?

Answer 8

Permeabilites of the ions

Question 9

What is the Goldman Hodgkin Katz equation?

Answer 9

Vm (membrane potential) = 58 Log x
(50xK out) + (1xNa out)
——————————-
(50xK in) + (1xNa in)