cognitive science 17 the electric brain part 2 jaime a. pineda, ph.d
Post on 21-Dec-2015
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TRANSCRIPT
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COGNITIVE SCIENCE 17
The Electric Brain
Part 2 Jaime A. Pineda, Ph.D.
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Phases of the Action Potential
Firing threshold is the point at which the number ofactivated Na+ channels > inactivated Na+ channels
Absolute refractory period
Relative refractory period
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Nodes of Ranvier
Initialsegment
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Advantages of myelination
• Reduces number of ion channels
• Reduces number of Na+ / K+ pump
• Increases speed of conduction
• Reduces energy needs
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Saltatory Conduction
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Exocytosis
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RECEPTORS
Ionotropic Metabotropic
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Ionotropic
Metabotropic
Form a channel
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Ionotropic Receptor
agonist
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antagonist
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Metabotropic Receptor
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(leads to openingof channel)
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Upregulation
Downregulation
Changes to Postsynaptic Receptor Density as a Function of the Amount of Neurotransmitter Released