electrical signals 2
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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Electrical Signals 2
BIOL 1407
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Propagation of AP in
Unmyelinated Axon
![Page 4: Electrical Signals 2](https://reader036.vdocuments.net/reader036/viewer/2022062321/568130e3550346895d96f5da/html5/thumbnails/4.jpg)
Saltatory Conduction
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Chemical Synapses
• Junction between two neurons
• Chemical communication
• Neurotransmitters
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Receptors
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Norepinephrine Norepinephrine
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Postsynaptic Potentials
• Changes in membrane potential of the postsynaptic membrane
• Receptors are chemically-gated channels
• Graded potential
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EPSPs
• EPSP = Excitatory PostSynaptic Potential
• Depolarization• Receptors are usually
Na+ or Ca2+ channels
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IPSPs
• IPSP = Inhibitory PostSynaptic Potential
• Hyperpolarization• Receptors are usually
K+ or Cl- channels
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Summation
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Comparative Nervous Systems
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Vertebrate Nervous System
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Brain Stem
Diencephalon
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Photo Credit: University of Wisconsin and Michigan State Comparative Mammalian Brain Collections and the National Museum of Health and Medicine, Wikimedia Commons
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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 BrainPicture Credit: Biodidac
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The End
Unless otherwise specified, all images in this presentation came from:
Campbell, et al. 2008. Biology, 8th ed. Pearson Benjamin Cummings.