A recently depolarized area of a cell membrane cannot generate an action potential because of theMultiple Choicehigh concentration of sodium ions in the extracellular fluid.the high concentration of potassium ions in the cytoplasm.absolute refractory period.presence of receptor sites on the membrane.
Question
A recently depolarized area of a cell membrane cannot generate an action potential because of theMultiple Choicehigh concentration of sodium ions in the extracellular fluid.the high concentration of potassium ions in the cytoplasm.absolute refractory period.presence of receptor sites on the membrane.
Solution
The reason a recently depolarized area of a cell membrane cannot generate an action potential is because of the absolute refractory period.
Here's a step-by-step explanation:
- An action potential is initiated when a stimulus causes the cell membrane to depolarize.
- Depolarization is the process where the negative internal charge of the cell becomes less negative due to an influx of sodium ions.
- After depolarization, the cell enters a state known as the refractory period, which is divided into two parts: the absolute refractory period and the relative refractory period.
- During the absolute refractory period, the cell cannot generate another action potential, no matter how strong a stimulus is applied. This is because the sodium channels that opened to depolarize the cell are inactivated and they must return to their resting state before they can be opened again.
- This absolute refractory period ensures that action potentials only travel in one direction along a neuron and that they are discrete events.
Similar Questions
The cell membrane immediately adjacent to an action potential depolarizes because ofMultiple ChoiceMembrane receptorsMembrane permeabilitySodium ionsLocal currents
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
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
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?
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.