What is the major determinant of the permeability of a membrane to a specific ion? Concentration of the ion outside the cell O Concentration of the ion inside the cell Number of open ion channels specific for that ion O Electrical charge of the ion

What is the major determinant of the permeability of a membrane to a specific ion? Concentration of the ion outside the cell O Concentration of the ion inside the cell Number of open ion channels specific for that ion O Electrical charge of the ion

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 10RE

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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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What is the major determinant of the permeability of a membrane to a specific ion?
Concentration of the ion outside the cell
O Concentration of the ion inside the cell
Number of open ion channels specific for that ion
O Electrical charge of the ion

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Assume that a membrane permeable to Na+ but not to Cl- separates two solutions. The concentration of sodium chloride on side 1 is higher than on side 2. Which of the following ionic movements would occur? a. Na+ would move until its concentration gradient is dissipated (until the concentration of Na+ on side 2 is the same as the concentration of Na+ on side 1). b. Cl- would move down its concentration gradient from side 1 to side 2. c. A membrane potential, negative on side 1, would develop. d. A membrane potential, positive on side 1, would develop. e. None of the preceding is correct.
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The most important diffusible ion in the establishment of the membrane potential is a. K+. b. Na+. c. Ca2+. d. Cl−.
A change in membrane potential which is due to ion influx or efflux in a single region with the ions then diffusing away from that region is called a(n) ______
What type of protein opens when the membrane depolarizes, such as when an action potential moves along the membrane? ligand-gated channels voltage-gated channels
Which of the following is the correct statement regarding ion channels? Physical deformation of the membrane cannot open ion channels Ligand-gating means that an ion binds to the channel, which stimulates its opening. If the channel pore was the right size, Na and K could both pass through because they have the same charge A voltage gated Na channel can open to allow Na movement against its electrochemical gradient
Binding of acetylcholine to postsynaptic membranes increases the conductance of Na+ into the cell. It is an example of Group of answer choices active transport voltage-gated channel ligand-gated channel passive transport symporter
What is the free energy change for the transport of calcium ions (Ca++) across a membrane from a region (left) where the concentration is 50 micromolar to a region (right) where the concentration is 50 micromolar? A membrane potential of 60 mV exists across the membrane where the right side is more negative than the left side. The temperature is 25 C.
The reason that resting membrane potential (RMP) is closer to the equilibrium potential of K+ (EK) rather than that of Na+ (ENa) is that… Group of answer choices -The driving force for Na+ ions at rest is high. -The membrane is much more permeable to Na+ ions than K+ ions at rest. -Only K+ ions have a concentration gradient, Na+ ions have approximately equal intracellular and extracellular concentrations -The membrane is much more permeable to K+ ions than Na+ ions at rest.
When the net charge on either side of the plasma membrane is zero, what else is true? There is an equal number of K+ ions on each side of the plasma membrane. The K+ leak channels are open. The electrochemical potential across the membrane is zero. The resting membrane potential is between -20 mV and -200 mV.