Membrane Potentials - resting Flashcards
What are the 3 types of membrane potentials?
action potentials
graded potentials
resting membrane potential
what is the intracellular resting membrane potential?
-70mV
What way does the Na/K pump move sodium and potassium?
2 potassium into cell and 3 sodium out of the cell
What potassium channels are open at rest?
leaky K+ channels
When K+ move out of the cell through leaky channels, what happens to the intracellular charge?
becomes negative
What typeof gradient is created when K+ leaks out of the cell?
electrical gradient
What is it called when K+ leaks out through its leaky channels?
down its concentration gradient
When is equilibrium created of K+ leaking out of the cell?
when the electrical gradient is equal and opposite to the concentration gradient
When is the resting potential achieved?
when an equilibrium is reached between the electrical gradient and opposite to the concentration gradient
What is the resting membrane potential dependent on?
the concentration gradient
What is the equilibrium potential equation?
Why is the resting membrane potential different to -90mv? (neurones)
Cl-
Na2+
k+
not just postassium
What hasa high concentration inside the cell?
potassium
What has a high concentration outside the cell?
sodium and potassium
What way do leaky sodium and chloride channels?
move inside the cell
What is the equation for the membrane potential?
