Action Potentials

The charge on sodium and potassium ions

• both are negative

• Na is negative and K is positive

• both are positive

• Na is positive and K is negative

Tags

NGSS.HS-PS1-1

Which is true MOST of the time?

• Na is INSIDE and K is OUTSIDE the axon

• Na AND K are BOTH OUTSIDE the axon

• Na is OUTSIDE and K is INSIDE the axon

• Na AND K are BOTH INSIDE the axon

Tags

NGSS.HS-LS1-3

The sodium potassium pump carries

• 2 Na+ out & 3 K+ in

• 3 Na+ out & 2 K+ in

• 2 Na+ in & 3 K+ out

• 3 Na+ in & 2 K+ out

Where are the Na/K pumps, Na channels & K channels found?

• in the terminal buttons

• on each dendrite

• along axon, buried in myelin sheath

• along axon, in Nodes of Ranvier

The Na channel lets sodium _______ and the K channel lets potassium ______

• in, in

• in, out

• out, out

• out, in

Which used energy (ATP)?

• sodium channel only

• sodium potassium pump only

• potassium channel only

• all of these

When is the sodium channel open?

• during rest only

• during repolarization only

• during depolarization only

• all the time

When is the potassium channel open?

• during rest only

• during repolarization only

• during depolarization only

• all the time

Which of these DECREASES polarity?

• the opening of the potassium channel

• the running of the sodium potassium pump

• the opening of the sodium channel

• all of these

Action potentials run along the ______ from ______ to ________.

• axon, dendrites, axon terminals

• axon, axon terminals, dendrites

• dendrites, axon, axon terminals

• axon terminals, axon, dendrites