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During the propagation of a nerve impulse, the action potential results from the movement of
  • a)
    K+ ions from intracellular fluid to extracellular fluid
  • b)
    Na+ ions from extracellular fluid to intracellular fluid
  • c)
    K+ ions from extracellular fluid to intracellular fluid
  • d)
    Na+ ions from intracellular fluid to extracellular fluid
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
During the propagation of a nerve impulse, the action potential result...
Action potential is a change in electrical potential that occurs across a plasma membrane during the passage of a nerve impulse. During this period, there is a localized and translent switch in electric potential across the membrane from -70 mV to +45 mV. It is due to the fact that the sodium channels open and the potassium channels remain closed. As a result, sodium channels permit the influx of Na+ by diffusion from extracellular fluid to intracellular fluid.
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Most Upvoted Answer
During the propagation of a nerve impulse, the action potential result...
The Movement of Na+ ions from Extracellular Fluid to Intracellular Fluid

The correct answer for the movement of ions during the propagation of a nerve impulse is option 'B', which states that the action potential results from the movement of Na+ ions from the extracellular fluid to the intracellular fluid. Let's understand this process in detail:

Resting Membrane Potential
- The resting membrane potential of a neuron refers to its electrical charge when it is not conducting an impulse.
- At rest, the inside of the neuron is negatively charged compared to the outside due to an uneven distribution of ions.
- The main ions involved in the resting membrane potential are sodium (Na+), potassium (K+), and chloride (Cl-).

Depolarization
- When a neuron receives a stimulus, the permeability of the cell membrane changes, leading to the depolarization of the neuron.
- Depolarization occurs when the voltage-gated sodium channels on the cell membrane open, allowing Na+ ions to enter the neuron.
- This movement of Na+ ions from the extracellular fluid to the intracellular fluid results in a change in the electrical charge across the membrane.
- The inside of the neuron becomes less negative, reaching a positive charge.

Action Potential
- The depolarization of the neuron triggers the generation of an action potential, which is a rapid change in the electrical charge of the neuron.
- The opening of voltage-gated sodium channels causes an influx of Na+ ions into the neuron, leading to further depolarization.
- This influx of Na+ ions creates a positive feedback loop, opening more sodium channels and allowing more Na+ ions to enter the neuron.
- As a result, the electrical charge inside the neuron rapidly becomes positive, reaching its peak value.

Repolarization
- After reaching its peak, the voltage-gated sodium channels close, and the voltage-gated potassium channels open.
- The opening of potassium channels allows K+ ions to exit the neuron, leading to repolarization.
- The movement of K+ ions from the intracellular fluid to the extracellular fluid restores the negative charge inside the neuron.

Hyperpolarization and Refractory Period
- During repolarization, the voltage-gated potassium channels remain open for a short period, causing an excessive efflux of K+ ions.
- This efflux of K+ ions briefly hyperpolarizes the neuron, making the inside of the neuron more negative than the resting membrane potential.
- This hyperpolarization creates a refractory period during which the neuron is unable to generate another action potential.

In summary, during the propagation of a nerve impulse, the action potential results from the movement of Na+ ions from the extracellular fluid to the intracellular fluid. This movement of Na+ ions leads to depolarization and the generation of an action potential, allowing the nerve impulse to travel along the neuron.
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During the propagation of a nerve impulse, the action potential results from the movement ofa)K+ ions from intracellular fluid to extracellular fluidb)Na+ ions from extracellular fluid to intracellular fluidc)K+ ions from extracellular fluid to intracellular fluidd)Na+ ions from intracellular fluid to extracellular fluidCorrect answer is option 'B'. Can you explain this answer?
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During the propagation of a nerve impulse, the action potential results from the movement ofa)K+ ions from intracellular fluid to extracellular fluidb)Na+ ions from extracellular fluid to intracellular fluidc)K+ ions from extracellular fluid to intracellular fluidd)Na+ ions from intracellular fluid to extracellular fluidCorrect answer is option 'B'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about During the propagation of a nerve impulse, the action potential results from the movement ofa)K+ ions from intracellular fluid to extracellular fluidb)Na+ ions from extracellular fluid to intracellular fluidc)K+ ions from extracellular fluid to intracellular fluidd)Na+ ions from intracellular fluid to extracellular fluidCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for During the propagation of a nerve impulse, the action potential results from the movement ofa)K+ ions from intracellular fluid to extracellular fluidb)Na+ ions from extracellular fluid to intracellular fluidc)K+ ions from extracellular fluid to intracellular fluidd)Na+ ions from intracellular fluid to extracellular fluidCorrect answer is option 'B'. Can you explain this answer?.
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