Depolarization occurs becauseMultiple Choicethe extra efflux of potassium ions causes the membrane potential to become slightly more positive than the resting value.more sodium ions diffuse into the cell than potassium ions diffuse out of it.the inactivation gates of the voltage-gated sodium ion channels begin to open, and the diffusion of sodium ions decreases.potassium ions continue to diffuse out of the cell after the inactivation gates of the voltage-gated sodium ion channels begin to close.the increased potassium ion permeability lasts slightly longer than the time required to bring the membrane potential back to its resting level.

Depolarization of a cell membrane occurs becauseMultiple ChoiceThe concentration of sodium and potassium ions in the cell is at equilibriumSodium ions are blocked from entering the cellMore sodium ions diffuse into the cell than potassium ions diffuse out of itThe concentration of sodium and potassium ions in the extracellular fluid is at equilibrium

Hyperpolarization, or afterpotential, occurs becauseMultiple Choicemore sodium ions diffuse into the cell than potassium ions diffuse out of it.the extra efflux of potassium ions causes the membrane potential to become slightly more positive than the resting value.the increased potassium ion permeability lasts slightly longer than the time required to bring the membrane potential back to its resting level.potassium ions continue to diffuse out of the cell after the inactivation gates of the voltage-gated sodium ion channels begin to close.the inactivation gates of the voltage-gated sodium ion channels begin to open, and the diffusion of sodium ions decreases.

What is produced when depolarization of a cell membrane reaches threshold?Multiple ChoiceA new action potential is produced.An existing action potential is stopped.Voltage-gated ion channels close.The absolute refractory period ends.

Depolarization of a cell membrane occurs because

During an action potential of a neuron, the type of ion that enters the cell and causes depolarization is the ion.