Nervous System Quiz 2

How are nerve impulses described in the notes?

• Sound waves

• Light beams

• Weak electric current, like a wave

• Strong electric current, like a bolt

What happens when a threshold stimulus is received by a neuron?

• Potassium ions diffuse outward

• Sodium channels open

• Potassium channels open

• Neuron membrane maintains resting potential

What is the result of sodium ions diffusing inward into a neuron?

• The membrane maintains resting potential

• The membrane repolarizes

• The membrane depolarizes

• Potassium channels open

Following the inward diffusion of sodium ions, what happens next in the neuron?

• Sodium channels open

• Sodium ions diffuse inward, depolarizing the membrane

• Potassium channels open

• Neuron membrane maintains resting potential

What is the effect of potassium ions diffusing outward from a neuron?

• The membrane depolarizes

• The membrane maintains resting potential

• The membrane repolarizes

• Sodium channels open

What does the action potential cause in the nerve fiber?

• It causes a local bioelectric current that stimulates the membrane.

• It stops the movement of ions across the membrane.

• It decreases the membrane's permeability to ions.

• It generates a permanent change in the membrane's structure.

What happens when a stimulus initiates local depolarization in a neuron?

• The resting membrane potential is maintained.

• The inside of the membrane becomes more negative.

• The inside of the membrane becomes more positive, leading to depolarization.

• The neuron immediately returns to its resting state.

Tags

NGSS.HS-LS1-3

What is depolarization?

• The process of restoring the resting membrane potential after depolarization

• The loss of the difference in charge between the inside and outside of the plasma membrane of a muscle or nerve cell due to a change in permeability and migration of sodium ions to the interior

• The increase in the difference in charge between the inside and outside of the plasma membrane

• The movement of potassium ions out of the cell

What does the number 1 indicate on the graph?

• Depolarization

• Repolarization

• Hyperpolarization

• Resting potential

What is represented by the number 2 on the graph?

• Resting potential

• Depolarization

• Repolarization

• Hyperpolarization