The Electrical Brain - Part 2 - PowerPoint PPT Presentation

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The Electrical Brain - Part 2

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... Saltatory Conduction Exocytosis RECEPTORS Ionotropic Metabotropic Ionotropic Metabotropic Form a channel Ionotropic Receptor agonist antagonist ... – PowerPoint PPT presentation

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Title: The Electrical Brain - Part 2


1
COGNITIVE SCIENCE 17 The Electric
Brain Part 2 Jaime A. Pineda, Ph.D.
2
Phases of the Action Potential
Absolute
refractory period
Relative refractory period
Firing threshold is the point at which the number
of activated Na channels gt inactivated Na
channels
3




Initial segment

Nodes of Ranvier
4
(No Transcript)
5
Advantages of myelination
  • Reduces number of ion channels
  • Reduces number of Na / K pump
  • Increases speed of conduction
  • Reduces energy needs

6
(No Transcript)
7
Saltatory Conduction
8

Exocytosis
9
(No Transcript)
10
RECEPTORS
Ionotropic
Metabotropic
11




Ionotropic
Form a channel


Metabotropic


12
Ionotropic Receptor
agonist
13
antagonist
14
(No Transcript)
15
Metabotropic Receptor
16
(leads to opening of channel)
17
Changes to Postsynaptic Receptor Density as a
Function of the Amount of
Neurotransmitter Released
Upregulation
Downregulation
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