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COGNITIVE SCIENCE 17 The Electric Brain Part 2 Jaime A. Pineda, Ph.D. PowerPoint Presentation
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COGNITIVE SCIENCE 17 The Electric Brain Part 2 Jaime A. Pineda, Ph.D.

COGNITIVE SCIENCE 17 The Electric Brain Part 2 Jaime A. Pineda, Ph.D.

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COGNITIVE SCIENCE 17 The Electric Brain Part 2 Jaime A. Pineda, Ph.D.

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  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 > inactivated Na+ channels

  3. Initial segment Nodes of Ranvier

  4. Advantages of myelination • Reduces number of ion channels • Reduces number of Na+ / K+ pump • Increases speed of conduction • Reduces energy needs

  5. Saltatory Conduction

  6. Exocytosis

  7. RECEPTORS Ionotropic Metabotropic

  8. Ionotropic Form a channel Metabotropic

  9. Ionotropic Receptor agonist

  10. antagonist

  11. Metabotropic Receptor

  12. (leads to opening of channel)

  13. Changes to Postsynaptic Receptor Density as a Function of the Amount of Neurotransmitter Released Upregulation Downregulation