Which statement best describes the Nernst equation? It relates the equilibrium potentials of multiple ions to their intra- and extracellular concentrations. It relates the equilibrium potential of an ion to its intra- and extracellular concentrations. O It relates the equilibrium potentials of multiple ions to their intracellular concentrations. It allows you to calculate internal and external ion concentrations O It allows you to determine the resting membrane potential

Which statement best describes the Nernst equation? It relates the equilibrium potentials of multiple ions to their intra- and extracellular concentrations. It relates the equilibrium potential of an ion to its intra- and extracellular concentrations. O It relates the equilibrium potentials of multiple ions to their intracellular concentrations. It allows you to calculate internal and external ion concentrations O It allows you to determine the resting membrane potential

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 2SQE: One of the important uses of the Nernst equation is in describing the flow of ions across plasma...

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Calculate the equilibrium membrane potential for Na* for an extracellular fluid concentration of 138 mM and an intracellular fluid concentration of 16 mM. Bereken die ewewigsmembraan potensiaal vir Na* vir 'n ekstrasellulêrevloeistof konsentrasie van 138 mM en 'n intrasellulêre vloeistof konsentrasie van 16 mM. a. -90 mV. b. -84 mV. C. -72 mv. d. -63 mV. e. +57 mV.
What determines the direction of ion movement through an ion channel? The electrochemical gradient for that ion O The membrane potential O The concentration gradient for that ion
The determination of membrane permeability to a specific solute is broadly Fick's first law that is modified to account fo.. all of the aboe O membrane thickness O the solute's ability to dissolve in lipids O the electrical interaction between the solute and the membrane O the size of the solute relative to the membrane lipids
The membrane potential for an excitable cell membrane is -70 mV, for sodium ions the Nernst equilibrium potential is +50 mV, the conductivity of the single sodium channel is 10 pS. What is the electrochemical potential difference that is the driving force for sodium ions to migrate? How much current flows through an open sodium channel under these conditions?
Potassium leak is a major determinant of resting membrane potential. What happens to the resting membrane potential when the intracellular concentration of potassium is increased to 120 mM? O a. It has no impact on the resting membrane potential O b. The resting membrane potential becomes more negative OC. The resting membrane potential becomes more positive O d. The resting membrane potential collapses
Voltage-gated sodium channels are open and allowing sodium to flow when: O The membrane is at the resting membrane potential O Tetrodotoxin (TTX) is applied to the membrane ▶ O Lidocaine is applied to the membrane O All of the above O None of the above
Which of the following is the most important contributor to the difference between the resting membrane potential and the equilibrium potential of potassium? A B Influx of Ca++ ions Influx of Cl- ions с D Influx of Na+ ions Electrogenic effect of Na+/K+ pump
What would the membrane potential be if the cell membrane suddenly became 10X more permeable to just sodium?
Under which circumstance is the Goldman equation equivalent to the Nernst equation? O when the cell membrane is only permeable to 1 ion O when the concentrations of the ions are equal outside and inside of the cell when the cell membrane is equally permeable to all ions O when there is no charge on the membrane
if an object b has a plasma sodium concentration of 135mOsm/L and an intracellular concentration of 4mOsm/L. It also has a plasma concentration of potassium of 20mOsm/L and an intracellular concentration of 200mOsm/L. studies identify that the cells have a permeability to potassium that is 10 times greater than sodium. What is the resting membrane potential
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.
A drug specifically blocks the Na+/K+ ATPase pump. What effect might this have on the action potential? O It will shorten the duration of the action potential as there will not be as many ions available to cross the membrane. None, as action potentials rely on channels for Na+ and K+ to cross the membrane, not pumps. It will not have an immediate effect, but eventually action potentials will stop as the Na+ and K+ gradients are depleted. It will make action potentials more likely to occur as the pump normally makes the cell more negative, so without it the membrane will reach threshold more easily.