A E -50 -70 1 3 Time (milliseconds) O The sodium channels are closed and potassium channels are open O The sodium and potassium channels are both depolarized Both the sodium and potassium channels are open Both the sodium and potassium channels are closed The sodium channels are open and potassium channels are closed Membrane Potential (mV)

A E -50 -70 1 3 Time (milliseconds) O The sodium channels are closed and potassium channels are open O The sodium and potassium channels are both depolarized Both the sodium and potassium channels are open Both the sodium and potassium channels are closed The sodium channels are open and potassium channels are closed Membrane Potential (mV)

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter35: The Nervous System

Section: Chapter Questions

Problem 9RQ: After an action potential, the opening of additional____voltage-gated ____ channels and The...

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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?
Nernst (equilibrium) Potential (mV) - 6.lol 0.07 0.125 D.094 lon Intracellular Extracellular Concentration (mM) Concentration (mM) K* 155 4 Nat 12 145 Ca** 104 1.5 4 120 D) If during the generation of an action potential in the skeletal muscle cell the membrane potential approaches +65 mV, membrane permeability for which ion likely plays a major role in membrane depolarization? Explain your choice.
What is the equilibrium membrane potential due to Na+ ions if the extracellular concentration of Na+ ions is 154 mM and the intracellular concentration of Na+ ions is 23 mM at 20 ∘C ?
Membrane Potential (mV) +35 0 -50 -70 0 A B C | 2 Time (milliseconds) 3 E 4 Use the figure showing phases of the action potential to answer the following question. Most of the voltage-gated sodium channels become open at label ____, and become inactivated at label
Part C-Comparing and Contrasting the Two Types of Voltage-Gated lon Channels Sort the phrases into the appropriate bins depending on whether they describe similarities or differences between voltage-gated K* channels and voltage-gated Na+ channels. > View Available Hint(s) Reset Help The polarity of the substances they transport across the membrane The direction of ion movement The stimulus that triggers opening through the channel The placement of the channel protein relative to the membrane The inactivation mechanism Similarities Differences
-60mV -90mV -70mk Refer to the figure of 3 action potentials. The spike height of this/these action potential(s) would depend on the concentration of extracellular sodium. A and B A only B only C only B and C
Which ion channel is open at the point beyond O? M N K - -55 -70 Time Leakage channel for sodium ions Leakage channel for potassium ions Voltage-gated ion channel for sodium ions Voltage-gated ion channel for potassium ions Membrane potential (mV)
If a particular neuron has an intracellular Chloride concentration of 154.3 mM, an extracellular Chloride concentration of 163.2 mM, and a membrane potential of -54.1, what is the net driving force (in mV) acting upon Chloride?
[Na*] [K*] This diagram is a drawing of normal conditions that occur in a neuron's axon (not all details are included). This stage that a living neuron would be in, would show that O no positive ions are inside the cell current is traveling down the axon O the cell will be at rest once the Na ions enter the cell O the cell is at rest O Na ions are predominantly outside the cell
Explain why the resting membrane potential is not equal to the K1equilibrium potential?
What happens to membrane potential during manipulation 4 in the attached figure (Figure 4.13 of the textbook)? 1 Efflux of Nat Nat efflux (logarithmic scale) 0 3 Recovery when K+ is restored 2 Nat efflux reduced by removal of external K 50 100 4 Efflux decreased by metabolic inhibitors, such as dinitrophenol, which block ATP synthesis 150 Time (min) 200 5 Recovery when ATP is restored " I 250 TATI 122 O Membrane potential does not change, because the Na+-K+ ATPase does not contribute to membrane potential. O Membrane potential is hyperpolarized, because the Na+-K+ ATPase is electrogenic and hyperpolarizes membrane potential when it is active. O Membrane potential is depolarized, because the Na+-K+ ATPase is electrogenic and hyperpolarizes membrane potential when it is active. 300
Which ion channel is open at phase K? +30 M N K -55 L -70 Time Voltage-gated ion channel specific to sodium ions Voltage-gated ion channel specific to potassium ions Ligand-gated ion channel specific to sodium ions Ligand-gated ion channel specific to potassium ions Membrane potential (mV)