Alert 5 Essay 3: Action Potential Generation Quiz

What is the value of resting potential maintained at during the resting state?

• -60mV

• -70mV

• -50mV

• -55mV

What happens during depolarization?

• Voltage-gated potassium channels open

• Voltage-gated sodium channels close

• Na+ inflow depolarizes the axon membrane

• Resting potential increases

If the depolarization value reach ____________, an action potential is generated.

• Repolarization phase

• Hyperpolarization phase

• Resting phase

• Treshold

Which event occurs during the rising phase of action potential?

• Voltage-gated sodium channels close

• Voltage-gated potassium channels open

• Na+ influx makes the inside axon membrane negative

• Resting potential is maintained

What happens during repolarization/falling phase of action potential?

• Inside axon becomes more positive

• Most voltage-gated potassium channels are closed

• Most voltage-gated sodium channels are open

• K+ ions inflow into axon membrane

What occurs during undershoot/hyperpolarization?

• Voltage-gated sodium channels are open

• Voltage-gated potassium channels are closed

• Inside axon becomes more positive

• Inside axon become more negative than resting state.

What is the threshold membrane potential for generating an action potential?

• -60mV

• -70mV

• -50mV

• -55mV

What happens to the voltage-gated potassium channels during repolarization?

• They remain unchanged

• They close

• They become inactive

• They open

What is the role of Na+ during the rising phase of action potential?

• Na+ influx makes the inside axon membrane positive

• Na+ inflow has no effect

• Na+ influx makes the outside axon membrane positive

• Na+ outflow from axon membrane

What is the membrane potential during undershoot/hyperpolarization?

• Slightly above -70mV

• Slightly below -70mV

• Slightly above -60mV

• Slightly below -60mV