Depolarization of membrane to threshold potential [ [ Choose ] up to threshold potential at the initial segment Conduction of action potentials along the axon [ [ Choose ] Opening of voltage-gated na+ channels [ [ Choose ] > >

Depolarization of membrane to threshold potential [ [ Choose ] up to threshold potential at the initial segment Conduction of action potentials along the axon [ [ Choose ] Opening of voltage-gated na+ channels [ [ Choose ] > >

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter4: Principles Of Neural And Hormonal Communication

Section: Chapter Questions

Problem 17RE

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Question

match the listed events to note if they would, or would not, occur in a neuron under the effects of tetrodotoxin. the cell has a resting membrane potential of -65mV. You should match these events at the initial segment of a bipolar neuron,

**Answer choice for all ( would occur, would not occur)

Depolarization of membrane to threshold potential
[
[ Choose ]
up to threshold potential at the initial segment
Conduction of action potentials along the axon
[
[ Choose ]
Opening of voltage-gated na+ channels
[
[ Choose ]
Increased influx of sodium
[
[ Choose ]
Inactivation of voltage-gated channels
[ Choose ]
Flux of sodium inside the membrante towards the
[ Choose ]
next anterograde Node of Ranvier
Release of neurotransmitters in from the neuron's
[
[ Choose ]
axon terminal
Closing of voltage-gated na+ channels
[
[ Choose ]
Opening of voltage-gated potassium channels
[
[ Choose ]
Closing of voltage-gated potassium channels
[
[ Choose ]
>
>
>
>
>
>
>
>
>

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Assume presynaptic excitatory neuron A terminates on a postsynaptic cell near the axon hillock and presynaptic excitatory neuron B terminates on the same postsynaptic cell on a dendrite located on the side of the cell body opposite the axon hillock. Explain why rapid firing of presynaptic neuron A could bring the postsynaptic neuron to threshold through temporal summation, thus initiating an action potential, whereas firing of presynaptic neuron B at the same frequency and the same magnitude of EPSPs may not bring the postsynaptic neuron to threshold.
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?)
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