Answered: Voltage-gated K+ channel senses voltage…

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Biochemistry

Voltage-gated K+ channel senses voltage across the plasma membrane and permits selective passage of K+ ions. True False

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 1RE: Conformational changes in channel proteins brought about by voltage changes are responsible for...

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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.

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Voltage-gated K+ channel senses voltage across the plasma membrane and permits selective passage of K+ ions.

True

False

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Conformational changes in channel proteins brought about by voltage changes are responsible for opening and closing Na+ and K+ gates during the generation of an action potential. (True or false?)
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Which of the following phases of an action potential is correctly matched with the changes in ion movement and membrane potential? All of these are correctly matched. Phase 1 – sodium movement into the cell Phase 3 – potassium movement into the cell Phase 2 – sodium movement out of the cell
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The membrane potential caused by differences in ions across the plasma membrane of an electrically excitable cell (when not stimulated) is called: action potential resting membrane potential graded potential local potential
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