Depolarization occurs becauseMultiple Choicepotassium ions continue to diffuse out of the cell after the inactivation gates of the voltage-gated sodium ion channels begin to close.more 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.the inactivation gates of the voltage-gated sodium ion channels begin to open, and the diffusion of sodium ions decreases.

Depolarization of a cell membrane occurs becauseMultiple ChoiceSodium 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 equilibriumThe concentration of sodium and potassium ions in the cell 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.

Depolarization of the cell membrane occurs when there is a rapid influx (inflow) ofMultiple Choicecalcium ions.amino acids.sodium ions.potassium ions.chloride ions.

During the depolarisation stage of an action potentialThe membrane potential returns to resting conditionsSodium (Na+) enters the cell down it's concentration gradientVoltage gated K+ channels are openPotassium (K+) enters the cell against its concentration gradient

Depolarization is initiated by a stimulus that makes the membrane potentialMultiple ChoiceUnchangedNeutralMore positiveMore negative