L8 (Feb 3 Notes) - Action Potentials Explain the chemical...

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Action Potentials Explain the chemical and electrical mechanisms involved in each of the three phases of a neural action potential. Predict the effects of modifications to membrane proteins or ion concentrations on the generation of neural action potentials. Analyze how different factors affect the direction and frequency of action potentials as they are conducted along an axon. Monday, February 2, 2015
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Last class: Electrotonic current passes between VG Na + channels, so that the action potential begins again at each VG Na + channel Monday, February 2, 2015
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AP Conduction Velocity How do R m , R i and C m work to affect the conduction speed of an action potential? Monday, February 2, 2015
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Variation in Signal Conduction Speed Table 4.3 Two ways to increase speed: myelin and increasing the diameter of the axon. Monday, February 2, 2015
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Myelination Glial cells wrap the axon, insulating it and allowing the current to ‘skip’ from unwrapped Node to Node. Monday, February 2, 2015
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Myelination => Saltatory Conduction Monday, February 2, 2015
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