Action potential

Question 1

what is the membrane potential at rest? at threshold?

Answer 1

-70mV

50mV at threshold

Question 2

What occurs during depolarization?

Answer 2

Na+ rushes into the cell increasing the membrane potential to +35, when an action potential is created.

Question 3

what occurs during repolarization?

Answer 3

K+ rushes out of the cell, decreasing the membrane potential to below -70mV (hyperpolarization)

Question 4

How is the resting membrane potential maintained?

Answer 4

by the Na+/K+ pump, which pumps 3Na+ out and 2K+ in, creating an overall negative charge inside the cell