Answered: Describe the mechanism through which a…

Describe the mechanism through which a potassium channel can selectively move K* ions across a membrane while preventing the movement of smaller Na* ions.

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

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter3: The Plasma Membrane And Membrane Potential

Section: Chapter Questions

Problem 7UC: Describe the contribution of each of the following to establishing and maintaining membrane...

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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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Describe the mechanism through which a potassium channel can selectively move K*
ions across a membrane while preventing the movement of smaller Na* ions.

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The accelerating flow of _______ ions through gated channels across the membrane triggers an action potential. a. potassium b. sodium c. hydrogen d. a and b
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There are differences in Na+, K+, and Cl- ion concentrations across the membrane. Knowing that ions like to flow down their respective concentration gradients explain how the movement of Cl- and K+ ions can result in membrane hyperpolarization.
Describe how the magnitude and polarity of the sodium and potassium membrane currents vary with the amplitude of membrane depolarization
Describe the concentration differences for Na+ and K+that exist across the plasma membrane.
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Explain the flow of ions in mechanically-gated ion channels.
What happens to the membrane potential when Na+/K+ pump is active?
The negatively charged intracellular environment and resulting resting membranepotential of neurons and muscle cells fundamentally develops because of:A. the presence of a high extracellular potassium concentration.B. the presence of negatively charged intracellular proteins.C. the high electron concentration found in the extracellular fluidsD. the presence of voltage-gated-sodium channells
Describe two mechanisms by which ion channels are gated
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