Neurons and Action Potentials

What is the name of the electrical impulse that neurons send?

• Voltage

• Current

• Action potential

• Resistance

What is the resting membrane potential of a neuron?

• -70 mV

• -55 mV

• +40 mV

• +75 mV

What is the purpose of the sodium-potassium pump in a neuron?

• To create a difference in charge between the inside and outside of the neuron

• To open voltage-gated channels

• To repolarize the neuron

• To trigger action potentials

What happens when a neuron reaches its threshold potential?

• The neuron returns to its resting state

• The neuron undergoes hyperpolarization

• Voltage-gated sodium channels open

• Voltage-gated potassium channels open

What is the purpose of the refractory period in a neuron?

• To prevent signals from traveling in both directions down the axon

• To maintain the resting membrane potential

• To trigger the sodium-potassium pump

• To open ligand-gated channels

What is the term for a small, localized change in membrane potential?

• Action potential

• Graded potential

• Hyperpolarization

• Repolarization

What is the purpose of myelin sheath on an axon?

• To increase the frequency of action potentials

• To decrease the conduction velocity of action potentials

• To prevent action potentials from occurring

• To increase the conduction velocity of action potentials

What is the term for the propagation of an action potential from one gap in the myelin to the next?

• Saltatory conduction

• Voltage-gated conduction

• Graded conduction

• Mechanically-gated conduction

What happens during repolarization of a neuron?

• Voltage-gated sodium channels open

• Voltage-gated potassium channels open

• The neuron undergoes hyperpolarization

• The sodium-potassium pump is activated

What is the main force behind every action, thought, and feeling in the body?

• Voltage

• Current

• Resistance

• Action potentials