Nervous System 9-2

Which two ions play a major role in an action potential?

• Sodium and Nitrogen

• Potassium and Chlorine

• Nitrogen and Chlorine

• Sodium and Potassium

When a neuron is at rest how are ions distributed?

• Na is outside, K is inside

• K is outside, Na is inside

• both Na and K are outside cell membrane

• both Na and K are inside the cell membrane

What creates an action potential

• K entering the neuron

• K exiting the neuron

• Na entering the neuron

• Na exiting the neuron

A resting neuron is considered to be_______________

• polarized

• depolarized

• inhibited

• stationary

An action potential occurs when the neuron is

• Polarized

• Depolarized

• Repolarized

• Hyperpolarized

If a stimulus is great enough the membrane potential reaches a level called ________ (-55 mv)

• Excitatory limit

• Threshold potential

• Inhibitory potential

• Membrane stimulation

Describe this membrane potential

• resting potential

• action potential

• charged potential

• equal potential

What is happening to this neuron?

• polarization

• depolarization

• repolarization

• emancipation

What is happening to this neuron?

• polarization

• depolarization

• repolarization

• emancipation

What do sodium-potassium pumps do?

• move Na in and K out

• move K in and Na out

• move Na and K into the neuron

• move Na and K out of the neuron