A recently depolarized area of a cell membrane cannot generate an action potential because of theMultiple ChoiceThe high concentration of potassium ions in the cytoplasmPresence of receptor sites on the membraneAbsolute refractory periodHigh concentration of sodium ions in the extracellular fluid
Question
A recently depolarized area of a cell membrane cannot generate an action potential because of theMultiple ChoiceThe high concentration of potassium ions in the cytoplasmPresence of receptor sites on the membraneAbsolute refractory periodHigh concentration of sodium ions in the extracellular fluid
Solution
The reason a recently depolarized area of a cell membrane cannot generate an action potential is because of the Absolute refractory period.
During the absolute refractory period, a second action potential absolutely cannot be initiated, no matter how large a stimulus is applied. This is because the sodium channels, which open in response to a voltage change, are inactivated. This means they are not responsive to any changes in voltage, and therefore, an action potential cannot be generated.
This period lasts for about 1-2 milliseconds after the start of the action potential. It is followed by the relative refractory period, during which a stronger than usual stimulus can generate a new action potential.
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The cell membrane immediately adjacent to an action potential depolarizes because ofMultiple ChoiceMembrane receptorsLocal currentsSodium ionsMembrane permeability
The charge difference across an unstimulated cell, called the Blank______ potential, can be attributed to the potassium and sodium concentrations inside and outside of the cell.Multiple choice question.action potentialresting membranedepolarizing potentialgraded potentialNeed help? Review these concept resource
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
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
What cation (positive charged ion) rushes into the cell during depolarization period of action potential?
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