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Class 03 upload - Bio 208 Class #3 How Neurons Communicate...

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Bio 208 Class #3 How Neurons Communicate I: Electrical Activity Sept 9, 2008
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Outline Ion Channels Generation of the Action Potential Propagation of the Action Potential Drugs that affect ion channels Pathology of the myelin sheath
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Information flow in the nervous system includes: 1. From one end of a neuron to the other. 2. From one neuron to another.
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Signals are transmitted from the dendrites to the axon terminal by Electrical transmission. Signals are transmitted between neurons usually by Chemicals.
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Responses to ion movement If Na+ enters the cell, it will Depolarize (become less negative) If K+ leaves the cell, it will Hyperpolarize (become more negative) If Cl- enters the cell, it will Hyperpolarize (become more negative)
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General Statement of Potentials and Excitability Depolarizing potentials or stimuli are EXCITATORY Hyperpolarizing potentials or stimuli are INHIBITORY
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Types of membrane channels Chemical gated – opens and closes
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This note was uploaded on 07/15/2009 for the course BIO 208 taught by Professor Lorne-mendell,s during the Fall '08 term at SUNY Stony Brook.

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Class 03 upload - Bio 208 Class #3 How Neurons Communicate...

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