Repolarization occurs becauseMultiple Choicemore sodium ions diffuse into the cell thanpotassium ions diffuse out of it.potassium ions continue to diffuse out of the cellafter the inactivation gates of the voltage-gatedsodium ion channels begin to close.the increased potassium ion permeability lastsslightly longer than the time required to bring themembrane potential back to its resting level.the extra efflux of potassium ions causes themembrane potential to become slightly morepositive than the resting value.the inactivation gates of the voltage-gated sodiumion channels begin to open and the diffusion ofsodium ions decreases.

At the resting stage, the Na+ and K+ channels remain closed.

Repolarization occurs because Multiple Choice more sodium ions diffuse into the cell than potassium ions diffuse out of it. potassium ions continue to diffuse out of the cell after the inactivation gates of the voltage-gated sodium ion channels begin to close.

Repolarization occurs because Multiple Choice more sodium ions diffuse into the cell than potassium ions diffuse out of it. potassium ions continue to diffuse out of the cell after the inactivation gates of the voltage-gated sodium ion channels begin to close.

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter4: Principles Of Neural And Hormonal Communication

Section: Chapter Questions

Problem 2SQE

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Concept explainers

Osmosis

In simple words, osmosis is the slow, gradual movement of a liquid through a membrane. But there are nuances to this process. For instance, there has to be an imbalance in the distribution of solute in the liquid on either side of the membrane, which has to be semipermeable. The liquid in the region with a lower solute concentration moves to the region with a higher concentration, thereby displacing the solution in the process. The objective is to equalize the concentration of molecules on both sides of the membrane; the displacement of liquid can be viewed as a byproduct of this equalization. Since there is no energy required to carry osmosis, it is considered a passive process.

Question

Repolarization occurs because
Multiple Choice
more sodium ions diffuse into the cell than
potassium ions diffuse out of it.
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.
the extra efflux of potassium ions causes the
membrane potential to become slightly more
positive than the resting value.
the inactivation gates of the voltage-gated sodium
ion channels begin to open and the diffusion of
sodium ions decreases.

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