Resting Membrane Potential Quiz

What is the typical resting membrane potential of a neuron?

• -70 mV

• -90 mV

• 0 mV

• -50 mV

Explain the role of sodium-potassium pumps in establishing the resting membrane potential.

• They help maintain the concentration gradients of sodium and potassium ions across the cell membrane.

• They control the movement of water across the cell membrane

• They help in producing ATP for the cell

• They regulate the pH level inside the cell

How does the permeability of the cell membrane to potassium ions contribute to the resting membrane potential?

• Allows for the movement of potassium ions out of the cell

• Allows for the movement of sodium ions into the cell

• Prevents the movement of potassium ions

• Has no effect on the resting membrane potential

Discuss the role of leak channels in maintaining the resting membrane potential.

• Leak channels have no role in maintaining the resting membrane potential

• Leak channels are responsible for active transport of ions across the membrane

• Leak channels allow the passive movement of ions across the membrane, helping to maintain the resting membrane potential by balancing the influx and efflux of ions.

• Leak channels only allow the influx of ions, not the efflux

Explain the concept of equilibrium potential and its relevance to the resting membrane potential.

• The equilibrium potential is the membrane potential at which the net flow of a particular ion across the membrane is zero. It is relevant to the resting membrane potential because the resting membrane potential is determined by the equilibrium potentials for the ions that contribute to it, such as potassium and sodium.

• The equilibrium potential is the membrane potential at which the net flow of a particular ion across the membrane is infinite. It is relevant to the resting membrane potential because the resting membrane potential is determined by the infinite potentials for the ions that contribute to it.

• The equilibrium potential is the membrane potential at which the net flow of a particular ion across the membrane is positive. It is relevant to the resting membrane potential because the resting membrane potential is determined by the positive potentials for the ions that contribute to it.

• The equilibrium potential is the membrane potential at which the net flow of a particular ion across the membrane is negative. It is relevant to the resting membrane potential because the resting membrane potential is determined by the negative potentials for the ions that contribute to it.

What factors can influence the magnitude of the resting membrane potential?

• Distance from the nearest blood vessel, type of cell organelles, and the age of the organism

• Ion concentration gradients, permeability of the membrane to different ions, and the activity of ion channels and pumps

• Amount of ATP in the cell, presence of organelles, and the shape of the nucleus

• Temperature of the surrounding environment, color of the cell membrane, and the size of the cell

Describe the changes in ion concentrations that occur during depolarization and hyperpolarization of the cell membrane.

• There is no change in ion concentrations during depolarization, and an influx of sodium ions and a decrease in potassium ion concentration during hyperpolarization.

• There is an influx of potassium ions and a decrease in sodium ion concentration during depolarization, and an efflux of sodium ions and a decrease in potassium ion concentration during hyperpolarization.

• There is an influx of sodium ions and a decrease in potassium ion concentration during depolarization, and an efflux of potassium ions and a decrease in sodium ion concentration during hyperpolarization.

• There is an efflux of sodium ions and an increase in potassium ion concentration during depolarization, and an influx of potassium ions and an increase in sodium ion concentration during hyperpolarization.

Discuss the impact of neurotransmitters on the resting membrane potential.

• Neurotransmitters have no impact on the resting membrane potential

• Neurotransmitters only affect the action potential, not the resting membrane potential

• Neurotransmitters cause the resting membrane potential to increase

• Neurotransmitters can affect the resting membrane potential by either depolarizing or hyperpolarizing the neuron.

Explain the concept of graded potentials and their role in modulating the resting membrane potential.

• Graded potentials are small changes in membrane potential that occur in response to a stimulus, and they play a role in modulating the resting membrane potential by either depolarizing or hyperpolarizing the cell.

• Graded potentials are small changes in membrane potential that occur in response to a stimulus, and they play a role in modulating the action potential by increasing the threshold.

• Graded potentials are small changes in membrane potential that occur in response to a stimulus, and they play a role in modulating the resting membrane potential by causing the release of neurotransmitters.

• Graded potentials are large changes in membrane potential that occur in response to a stimulus, and they play no role in modulating the resting membrane potential.