013 A Review of the Action Potential

What part of the neuron is primarily involved in the action potential?

• Dendrite

• Axon

• Cell body

• Synapse

What happens when a stimulus does not reach the threshold?

• Nothing happens

• An action potential is generated

• The neuron depolarizes

• The neuron becomes hyperpolarized

Which ion rushes into the cell to initiate depolarization?

• Chloride

• Calcium

• Sodium

• Potassium

What is the equilibrium potential for sodium ions during depolarization?

• -93 millivolts

• -70 millivolts

• 58 millivolts

• 0 millivolts

What causes potassium ions to leave the cell during repolarization?

• Presence of calcium ions

• Equilibrium potential of sodium

• Positive charge inside the cell

• Negative charge inside the cell

What is the equilibrium potential for potassium ions?

• -93 millivolts

• 58 millivolts

• -70 millivolts

• 0 millivolts

What role do sodium-potassium pumps play in the action potential?

• They depolarize the cell

• They repolarize the cell

• They restore the resting membrane potential

• They initiate the action potential