Neurons and Action Potentials Quiz

What is the action potential?

• A temporary reversal of a membrane potential

• A permanent change in the cell's structure

• A type of muscle contraction

• A form of chemical reaction

What is the resting membrane potential of a neuron?

• -70 millivolts

• -55 millivolts

• 40 millivolts

• 0 millivolts

What triggers the opening of voltage-gated sodium channels?

• A membrane potential of 40 mV

• A membrane potential of around -55 mV

• A membrane potential of -70 mV

• A membrane potential of 0 mV

What is the role of the sodium-potassium pump?

• To create a chemical reaction

• To pump potassium out of the cell

• To pump sodium into the cell

• To pump sodium out and potassium into the cell

What is the term for the flow of electricity from one point to another?

• Resistance

• Potential

• Voltage

• Current

What happens during depolarization?

• The cell becomes more positive inside

• The cell becomes more negative inside

• The cell stops functioning

• The cell remains at resting potential

What is the refractory period?

• A time when the neuron is most active

• A time when the neuron cannot respond to another stimulus

• A time when the neuron is hyperpolarized

• A time when the neuron is at rest

What is the function of myelin sheath on an axon?

• To create new neurons

• To speed up the transmission of impulses

• To slow down the transmission of impulses

• To stop the transmission of impulses

What is saltatory conduction?

• The jumping of action potentials from one node to another

• The creation of new action potentials

• The continuous flow of action potentials

• The stopping of action potentials

What is a graded potential?

• A small change in membrane potential in a localized part of the cell

• A large change in membrane potential along the entire axon

• A permanent change in the cell's structure

• A type of muscle contraction