Resting Membrane Potential

Question 1

Resting Membrane Potential (RMP)

Answer 1

-amount of electricity in our membrane at rest.
-determined by the concentration of different ions and different protiens on each side. The electrical difference between two sides

Question 2

_____ is most concentrated on the outside of cell membrane

Answer 2

Na+ ions

Question 3

_____ is most concentrated on the inside of the cell membrane.

Answer 3

K+ ions

Question 4

Why does the RMP typcially stay electronegative?

Answer 4

potassium leaves the cell at a faster rate than sodium going in the cell because there are more potassium leak chanels than sodium leak chanels (membrane is more permeable to K+ than Na+)

CELL HAS A NET LOSS OF POSTIVE IONS

Question 5

What is the typical RMP? and why

Answer 5

-70 mv.
inside cell being negative and outside being postive

This number is the potential energy to do work!!

Question 6

At rest, there are large amounts of _____ inside the cell and large amounts of ______outside the cell

Answer 6

At rest, there are large amounts of POTASSIUM ions inside the cell and large amounts of SODIUM IONS outside the cell

Question 7

what sets up the RMP?

Answer 7

the movemnet of sodium and potassium ions down leak chanels

Question 8

what type of pump MAINTAINS the resting membrane potential?

Answer 8

the Sodium ATPase pump.

It makes up for the sodium and potassium leaks. It gets sodium back out of cell and potassium back in cell.

*leak channels help but are NOT what are maintaing the RMP at rest.