Wk3L1s(1) - Announcements Bisc 327 Intro Neuroscience Extra...

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Announcements Bisc 327: Intro. Neuroscience Extra Credits: Due 1 week from day assigned, please e-mail to me with subject Bisc 327 ExtraCredit #X your name We will get to reading assignments today May get to beginning of Planet Soma
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Animation 3.2 The Resting Membrane Potential
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Action Potential Phases Threshold Action Potential Determined by Ion Permeability
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Outside cell Inside cell K+ K+ Na+ Na+ AP Ion Channels Voltage Gated Na+ Channel Voltage Gated K+ Channel Passive “Leaky” K+ Channel Passive Leaky Na+ Channel
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Rosenweig,Breedlove, Watson 2005, Biological Psychology In Out
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Why is the Action Potential Unidirectional?
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Absolute refractory period The Voltage-Gated Sodium Channel cannot be opened again by depolarization until reset at rest Relative refractory period During after potential. Membrane hyperpolarized until gated K+ channel closes. Takes more depolarizing current to reach threshold. Refractory Period
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Action Potential Propagation
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Spike(AP)-initiation zone
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Propagation - Adjacent membrane to threshold - Directional - Magnitude maintained - Speed determined by neuron characteristics
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Conduction Velocity
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Like excitatory post synaptic potentials, action potentials spread passively?
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  • Fall '14
  • Day,E
  • Neuroscience, Refractory period, Synaptic Transmission

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