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Phases and Mechanisms of Neuronal Signaling: A Comprehensive Overview

Explore the intricate processes of action potentials, refractory periods, myelination, synaptic receptors, and their regulation in this comprehensive guide to the electric brain. Gain insights into key concepts and mechanisms in cognitive science.

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Phases and Mechanisms of Neuronal Signaling: A Comprehensive Overview

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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

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