Nervous Communication Quiz

What is the resting potential of a neuron?

• +30 mV

• 0 mV

• -55 mV

• -70 mV

What is the role of the sodium-potassium pump?

• Maintains resting potential by passive diffusion

• Moves Na+ ions out of the cell and K+ ions into the cell

• Moves K+ ions out of the cell

• Moves Na+ ions into the cell

What happens during depolarization?

• K+ ions flow into the cell

• Na+ ions flow out of the cell

• The resting potential is restored

• Na+ ions flow into the cell

What is the threshold potential for a neuron to fire an action potential?

• +30 mV

• -70 mV

• 0 mV

• -55 mV

What does the all-or-none law state?

• Action potentials can be inhibited

• Action potentials can be partially fired

• Action potentials are always the same size

• Action potentials vary in size

What is the function of myelin sheath in neurons?

• Increases resting potential

• Prevents action potentials

• Decreases the speed of impulse transmission

• Increases the speed of impulse transmission

What is the minimum stimulus intensity required to fire an action potential called?

• Resting stimulus

• Refractory stimulus

• Action stimulus

• Threshold stimulus

What occurs during repolarization?

• Na+ channels open

• K+ channels close

• K+ ions flow out of the cell

• Na+ ions flow into the cell

What is the refractory period?

• Time when a neuron cannot fire another action potential

• Time when a neuron can fire again

• Time when depolarization occurs

• Time when resting potential is established

What is saltatory conduction?

• Impulse travels only at the axon terminals

• Impulse is slowed down by myelin

• Impulse jumps from node to node

• Impulse travels continuously along the axon