Quiz on Membrane Potential and Nerve Cell Physiology

What is the effect of the Na+–K+ pump on membrane potential?

• It stabilizes the membrane potential.

• It decreases the membrane potential.

• It has no effect on the membrane potential.

• It increases the membrane potential.

What happens to membrane potential during depolarization?

• It remains constant.

• It becomes more negative.

• It becomes less negative.

• It becomes positive.

What is the equilibrium potential for K+?

• The potential that is always positive.

• The potential that causes depolarization.

• The potential at which K+ ions are at equilibrium.

• The potential at which K+ ions are actively pumped out.

What is hyperpolarization?

• A state of equilibrium.

• A return to resting potential.

• An increase in membrane potential.

• A decrease in membrane potential.

Which of the following describes graded potential?

• A response that always leads to action potential.

• A variable response to a stimulus.

• A fixed response to a stimulus.

• A response that does not change with stimulus strength.

What is the role of gated channels in nerve cells?

• To maintain resting potential.

• To stabilize the membrane potential.

• To allow ions to flow in response to stimuli.

• To prevent any ion movement.

What is the primary function of excitable tissues?

• To provide structural support.

• To facilitate nutrient absorption.

• To transmit electrical signals.

• To store energy.

What occurs during repolarization?

• Membrane potential becomes less negative.

• Membrane potential returns to resting state.

• Membrane potential remains unchanged.

• Membrane potential becomes more positive.

What is the effect of simultaneous K+ and Na+ movement on membrane potential?

• It always causes hyperpolarization.

• It can lead to depolarization or hyperpolarization.

• It has no effect.

• It only affects K+ movement.

What is polarization in the context of nerve cells?

• The balance of passive and active transport.

• The process of ion movement.

• The state of having a positive membrane potential.

• The state of having a negative membrane potential.