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Electrical Signals 2

Electrical Signals 2. BIOL 1407. Propagation of AP in Unmyelinated Axon. Saltatory Conduction. Chemical Synapses. Junction between two neurons Chemical communication Neurotransmitters. Receptors. Norepinephrine. Norepinephrine. Postsynaptic Potentials.

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Electrical Signals 2

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  1. Electrical Signals 2 BIOL 1407

  2. Propagation of AP in Unmyelinated Axon

  3. Saltatory Conduction

  4. Chemical Synapses • Junction between two neurons • Chemical communication • Neurotransmitters

  5. Receptors

  6. Norepinephrine Norepinephrine

  7. Postsynaptic Potentials • Changes in membrane potential of the postsynaptic membrane • Receptors are chemically-gated channels • Graded potential

  8. EPSPs • EPSP = Excitatory PostSynaptic Potential • Depolarization • Receptors are usually Na+ or Ca2+ channels

  9. IPSPs • IPSP = Inhibitory PostSynaptic Potential • Hyperpolarization • Receptors are usually K+ or Cl- channels

  10. Summation

  11. Comparative Nervous Systems

  12. Vertebrate Nervous System

  13. Diencephalon Brain Stem

  14. Photo Credit: University of Wisconsin and Michigan State Comparative Mammalian Brain Collections and the National Museum of Health and Medicine, Wikimedia Commons

  15. Bird Brains • Bird brains are complex on inside, not on surface • PBS: Bird Brains • http://www.pbs.org/wgbh/nova/sciencenow/3214/03-brain.html • Video: http://www.youtube.com/watch?v=BGPGknpq3e0 Pigeon Brain Picture Credit: Biodidac

  16. The End Unless otherwise specified, all images in this presentation came from: Campbell, et al. 2008. Biology, 8th ed. Pearson Benjamin Cummings.

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