Action Potentials

An Action Potential involves the movement of

• Positive electrons

• Negative electrons

There is a charge of -70 mv _________ the neuron when at rest

• Inside

• Outside

Depoloarization Occurs as ________ moves into the cell

• Cl-

• K+

• Na+

Repolarization occurs as a result of

• Na+ moves out of the cell

• The sodium-potassium pump

• K+ moves out of the cell

Action Potentials can only move in 1 direction because of the refractory period

• True

• False

Voltage gated Na+ channels open and an Action Potential occurs when

• Na+/K+ pump brings in Na+

• enough + charges enter the neuron to bring it to threshold (-55mv)

• any Na+ enters the neuron

Repolarization _______ the voltage inside the cell

• Increases

• Decreases