Quiz on Nerve Impulses and Neuron Function

What is the typical resting potential of a neuron?

• 0mV

• -90mV

• -50mV

• -70mV

What is the role of the sodium-potassium pump?

• To facilitate synaptic transmission

• To generate action potentials

• To maintain resting potential

• To increase the speed of nerve impulses

What happens during the action potential?

• Sodium channels close

• The membrane becomes hyperpolarized

• Potassium ions rush into the axon

• Sodium ions rush into the axon

What does the all-or-none law state?

• Action potentials occur at different speeds

• Action potentials vary in strength

• Action potentials can be partially generated

• Action potentials occur fully or not at all

What is the function of the myelin sheath?

• To facilitate neurotransmitter release

• To enhance synaptic connections

• To prevent electrical code from leaking

• To increase ion permeability

What occurs during the refractory period?

• The potassium channels are closed

• The sodium channels are permanently open

• The neuron resists further action potentials

• The neuron is ready to fire again

What is the primary characteristic of local neurons?

• They are fully developed neurons

• They are non-axon neurons

• They exchange information with distant neurons

• They have long axons

What initiates the depolarization of a neuron?

• Increased potassium flow

• Increased sodium flow

• Decreased sodium flow

• Decreased potassium flow

What is saltatory conduction?

• Continuous conduction along the axon

• Transmission without myelin sheath

• Slow transmission of impulses

• Jumping of action potentials from node to node

What is the primary ion that flows into the neuron during action potential?

• Calcium

• Chloride

• Potassium

• Sodium