Which of the following BEST explains the inside negative potential in resting neurons? sodium flows down its electrochemical gradient through sodium-selective channels that are open in resting neurons membrane transporters produce a large sodium concentration gradient by selectively accumulating sodium ions outside the cell the membrane of a resting neuron is more permeable to potassium ions than to other ions present a larger concentration of chloride ions are found inside the cell making the inside of the cell more negative compared to the outside of the cell

Which of the following BEST explains the inside negative potential in resting neurons? sodium flows down its electrochemical gradient through sodium-selective channels that are open in resting neurons membrane transporters produce a large sodium concentration gradient by selectively accumulating sodium ions outside the cell the membrane of a resting neuron is more permeable to potassium ions than to other ions present a larger concentration of chloride ions are found inside the cell making the inside of the cell more negative compared to the outside of the cell

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter39: Information Flow And The Neuron

Section: Chapter Questions

Problem 5TYK: The major role of the Na+/K+ pump is to: a. cause a rapid firing of the action potential so the...

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The major role of the Na+/K+ pump is to: a. cause a rapid firing of the action potential so the inside of themembrane becomes momentarily positive. b. decrease the resting membrane potential to zero. c. hyperpolarize the membrane above resting value. d. cause an action potential to enter a refractory period. e. maintain the resting membrane potential at a constantnegative value.
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
The resting potential is dependent upon the electrochemical gradient for potassium ions because: The permeability of the resting membrane to potassium is higher than for other ions Of the activity of the sodium/potassium ATPase pump Cells contain largely potassium The permeability to sodium ions is very small except during action potentials
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.
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
An action potential is regarded as an example of positive feedback. Which of the following examples below best illustrates the positive feedback aspect of an action potential? Voltage gated potassium ion channels open slowly and remain open long enough to cause hyperpolarization The sodium potassium pump consistently moves ions as long as ATP is available, and regardless of membrane potential changes. A threshold stimulus will cause the opening of voltage gated sodium ion channels that will cause further depolarization by opening still more voltage gated sodium ion channels along the axon.
Please ASAP. Thanku Ion Extracellular Concentration (mM) Intracellular Concentration (mM) Na+ 440 50 K+ 20 400 Cl- 560 52 Ca++ 10 1 If one increased the extracellular concentration of K+, what would happen to the membrane potential? Cannot predict becomes more negative No change becomes more positive
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.
When the membrane voltage shifts from the RMP to a more negative voltage; this is a depolarization repolarization hyperpolarization polarization
Which of the following does NOT contribute to the establishment or maintenance of the neuron resting membrane potential? Oa sodium and potassium ions are actively transported across the cell membrane which maintains the resting membrane potential Ob. negatively charged proteins are inside the neuron and are not transported out Oc potassium ions are highly concentrated outside the cell and their are many potassium leakage channels in the membrane Od. sodium ions are more highly concentrated outside the cell and there are fewer sodium ion leakage channels in the membrane
If a potassium channel is held open for even longer, leading to an even bigger hyperpolarization of the cell what will happen in an afferent neuron? action potentials will have a larger amplitude action potentials will have a small amplitude less frequent action potentials in the neuron more frequent action potentials in the neuron
The interior of a neuron's plasma membrane at resting membrane potential will have a positive charge and contains less sodium than outside of the cell positive charge and contains more sodium than outside the cell negative charge and contains less sodium than outside the cell O negative charge and contains more sodium than outside the cell