Action Potential

resting potential

depolarization

repolarization

hyperpolarization

-70mV

resting potential is...

3 Na, 2 K

how many Na & K go through the pump at a time?

both channels closed

during resting potential, what channels are closed/open?

Na channel open, K channel closed

during depolarization, what channels are closed/open?

K channel open, Na channel closed

during hyperpolarization, what channels are closed/open?

both channels closed

When returning to resting potential, what channels are closed/open?

positive

during resting potential, is the outside negative or positive?

positive

during depolarization, is the inside of the cell becoming more negative or positive?

negative

during repolarization, is the inside of the cell becoming more negative or positive?

positive

during hyperpolarization, is the outside negative or positive?

negative

during the refractory period, is the inside of the cell negative or positive?

30 mv

the height of the action potential is around ____

because the inside is more negative than the outside

why is the resting potential -70mv?

Na rushing into cell

Why is the membrane potential increasing during depolarization?

because it took out more K than needed

why is hyperpolarization more negative than resting potential?

Na channels closed, potassium channels open

During repolarization is what channels are open/closed?

The Na/K pump is moving Na out and K in

During hyperpolarization how is the cell returning to resting potential?

How many Na and K does the sodium potassium pump move at a time?

Moves 3 Na out and 2 K in