Classify the given items with the appropriate group. Neuron is hyperpolarized Occurs when voltage-gated sodium channels have returned to resting state No amount of stimulus will initiate a second action potential Ensures that the action potential moves down the axon in only one direction Voltage-gated sodium channels are opened then closed in the inactivated state Occurs about 1 millisecond after an action potential Relative Refractory Period Absolute Refractive Period

Classify the given items with the appropriate group. Neuron is hyperpolarized Occurs when voltage-gated sodium channels have returned to resting state No amount of stimulus will initiate a second action potential Ensures that the action potential moves down the axon in only one direction Voltage-gated sodium channels are opened then closed in the inactivated state Occurs about 1 millisecond after an action potential Relative Refractory Period Absolute Refractive Period

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 6TYK: In the propagation of a nerve impulse: a. the refractory period begins as the K+ channel opens,...

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In the propagation of a nerve impulse: a. the refractory period begins as the K+ channel opens, allowing K+ ions to flow outward along their concentrationgradient. b. Na+ ions flow out of the axon with their concentration gradient. c. positive charges lower the membrane potential to its lowestaction potential. d. gated K+ channels open at the same time as the activationgate of Na+ channels closes. e. the depolarizing stimulus lowers the membrane potential toopen the Na+ gates.
A(n)______neuron has one axon and one____ dendrite extending directly from the cell body. unipolar bipolar multipolar pseudounipolar
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'charnel
An inhibitory postsynaptic potential (IPSP) is associated with O hyperpolarization a change in sodium ion permeability opening of voltage-regulated channels O the movement of calcium ions
Action potential +40 Threshold -55 Failed initiations Resting state -70 Stimulus T Refractory period 3. 4. Time (ms) Which of the following are true about the propagation of an action potential? O Action potential is triggered by the opening of voltage gated potassium channels Once threshold potential is reached, the neuron always depolarizes The refractory period prevents propagation back to the point of initiation of the action potential Once initiated, the action potential propagates in an all or nothing fashion Voltage (mV) Depolarization Repolarization
Axon segment depolarized to threshold AP regenerated in adjacent axon segment Voltage-gated Na* channels open Local current flows Influx of Na* to axon segment Current flows continuously Stimulation of initial axon segment
A 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 occur
Action 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 while
Which of the following is/are true about action potentials? Select all correct asnwers. Group of answer choices always has the same amplitude (amount of depolarization) always has the same duration information is coded through the frequency of action potentials action potentials can sum toge
Absolute refractory periods in axons: Result from conformational changes in voltage gated K channels after opening O Result from Cl channel induced hyperpolarization O Result from Ca dependent phosphorylation of K channels Result from conformation changes in voltage gated Na channels after opening O Result from Ca dependent phosphorylation of Na channels
Action 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 Repolarization
Myelination beginning Аxon Internode Oligodendrocytes Neurolemma The myelin sheath and The myelin sheath in the CNS Nodes Мyelin Schwann cell| of Ranvier myelination in the PNS (b)