M&R: Resting and Membrane Potential

Question 1

What is the range of values of membrane potential for cardiac/skeletal cells?

Answer 1

-80mV to -90mV

Question 2

What is the range of values of membrane potential for nerve cells?

Answer 2

-50mV to -75mV

Question 3

What are the intracellular values of Na+, Cl-, K+ and A-?

Answer 3

Na+ > 10mM
Cl- > 3mM
K+ > 160mM
A- > 167mM

Question 4

What are the extra cellular values of Na+, Cl-, K+ and A-?

Answer 4

Na+ > 145mM
Cl- > 114mM
K+ > 4.5mM
A- > 40mM

Question 5

What is the range of values of membrane potential for animal cells?

Answer 5

-20mV to -90mV

Question 6

Define the term equilibrium potential.

Answer 6

The electrical potential that exactly balances a chemical concentration gradient for a particular ion (also called the reversal potential).