Resting and Action Potential

Question 1

There are chemicals Na+ and K+ inside and outside a cell. During resting potential, which chemical leaves the cell?

Answer 1

K+ ions are greater inside the cell, and are released because the K+ channel is open during resting potential.

Question 2

What is the concentration gradient?

Answer 2

When the concentration of positively charged ions gets too great inside the cell, the excess is released.

Question 3

What is the electrical gradient?

Answer 3

When the amount of positively charged ions gets too great outside the cell, the electrical gradient tries to drive the K+ ions back inside the cell.

Question 4

During Resting Potential are the K+ and Na+ channels open?

Answer 4

Na+ channels are closed and K+ channels are open.

Question 5

What is depolarization?

Answer 5

Reduction in the electrical difference between the inside and outside of the cell.

Question 6

What is Action Potential?

Answer 6

When the threshold of around -40mz (gets close to zero) is reached, the Na+ channels will open in order to bring the threshold back down to around -80mz. Action potential is rapid depolarization.

Question 7

During the refactory state, what happens to depolarization?

Answer 7

It is blocked. This is different from when the channels are closed.

Question 8

What three states can the Na+ channels be in?

Answer 8

Closed, open and refactory. During the refactory state, for a short period of time, those cells will stay closed even if we reach the -60mv. Which is enough time for the action potential to reach -80.