Anatomy & Physiology
1st Edition
ISBN: 9781938168130
Author: Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble
Publisher: OpenStax College
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Textbook Question
Chapter 12, Problem 24RQ
Voltage-gated Na+ channels open upon leaching what state?
- resting potential
- threshold
- repolaiization
- overshoot
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Membrane permeability at the rising phase of an action potential is dominated by:
O Co-transporters
Nongated Channels
O K+ Voltage-gated Channels
O Na+ voltage-gated Channels
O Chemically-gated Channels
The membrane voltage in graded potentials can be produced by
Oopen channels and ligand-gated chanels
Ovoltage-gated channels
Oligand-gated and mechanically gated channels
Oligand-gated channels
mechanically gated channels
State whether the channels listed would be open or closed at the corresponding numbered phases of the action potential graph.
Phase on Graph
Sodium Voltage Gated channels
Potassium Voltage Gated channels
1
2
3
4
Chapter 12 Solutions
Anatomy & Physiology
Ch. 12 - In 2003, the Nobel Prize in Physiology or Medicine...Ch. 12 - Visit this site...Ch. 12 - Visit this site...Ch. 12 - View the University of Michigan Webscope...Ch. 12 - What happens across the membrane of an...Ch. 12 - Visit this site...Ch. 12 - Watch this video...Ch. 12 - Watch this video...Ch. 12 - Which of the following cavities contains a...Ch. 12 - Which structure predominates in the white matter...
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- Conformational changes in channel proteins brought about by voltage changes are responsible for opening and closing Na+ and K+ gates during the generation of an action potential. (True or false?)arrow_forwardThe accelerating flow of _______ ions through gated channels across the membrane triggers an action potential. a. potassium b. sodium c. hydrogen d. a and barrow_forwardWhich of the following voltages would most likely be measured during the relative refractory period? +30 mV 0 mV -45 mV -80 mvarrow_forward
- What stage of the action potential is illustrated by the set up shown? interstitial fuid axon cytoplasm interstitial fiuid Resting potential Hyperpolarization O Depolarization Repolarization K'charnelarrow_forwardAction potentials propagate in one direction because of: O K+ Voltage-gated Channels become inactive for a while O Nat Voltage-gated Channels become inactive for a while O K+ nongated Channels become inactive for a while O Nat nongated Channels become inactive for a whilearrow_forwardA membrane potential (Vm) labeled axis on the graph In the graph draw the phases of the action potential Include the channels involved and when they open and close matching them to the Vm Indicate the periods in which the action potential can or cannot occurarrow_forward
- 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 labelarrow_forwardAction potential +40 55 Threshold Falled initiations Resting state -70 Stimulus 1 Refractory period Time (ms) At the peak of the action potential, which of the following are true? Select all that apply the membrane potential is close to but less that the K+ equilibrium potential |voltage gated K+ channels close voltage gated K+ channels open the membrane potential is close to but less that the Na+ equilibrium potential Voltage (mV) Depolarization Repolarizationarrow_forwardchannels are specifically attuned to the action The voltage-gated potential threshold. O cr Na* O K* O Ca2+arrow_forward
- Electrophysiology of the Neuron Phase State of lon Channels Movement of lons Voltage Across Membrane RMP Resting Membrane Potential Hyperpolarizing Graded Potential IPSP Depolarizing Graded Potential EPSP Depolarization Phase of Action Potential Peak of Action Potential Repolarization Phase of Action Potential Hyperpolarization Phase of Action Potential Return to RMP All voltage gated channels - CLOSED All chemically gated channels -CLOSED Voltage gated Na* CLOSED Voltage gated Na' OPEN Na+ and K+ leak channels - OPEN Na+ K+ pump working K+ Voltage gates close slowly Voltage gated K* CLOSED Voltage gated K* OPEN Cl- chemically gated channels- OPEN Na+ chemically gated channels-OPEN K+ chemically gated channels -OPEN 2 K+ pumped IN 3 Na+ pumped OUT K+ diffuses OUT Na* diffuses IN K+ diffuses out or Ch -70 mV to -56 mV -55mV to +30 mv -70 mV +30mv More negative than -70 mV +30mV to -70 mVarrow_forwardThe trigger for an action potential is: Osodium Opotassium O sodium and potassium O the voltage-gated sodium channels are closed O the threshold potentialarrow_forwardTable - Summary of the Events of an Action Potential Stage Name of stage Membrane Potential Movement of Na+ or Status of voltage-gated ion channels (mV) K+ in or out of the аxon 1 2 3 4 5arrow_forward
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