lecture_10 - Reduces membrane capacitance and so increases...

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Diversity in neuronal structure and function Diameter of axon Myelin sheath Diversity in synaptic transmission
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Factors that affect the speed of conduction Length constant Larger length constant -> membrane depolarization travels further –> faster conduction Reduced by Intracellular resistance Movement of positive charge across membrane
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Example of variation in axon diameter Length constant/ speed of conduction affected by diameter of the axon (e.g., see Fig. 5.25/ 4.25) Fig 5.24/ 4.24
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Factors that affect the speed of conduction Length constant affected by Diameter of the axon (e.g., see Fig. 5.25/ 4.25) Myelin sheath
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Myelin sheath Promotes saltatory conduction Increases membrane resistance (and so increases length constant and speed of conduction)
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Unformatted text preview: Reduces membrane capacitance and so increases speed of conduction Reduces movement of sodium and potassium needed (and so reduces metabolic costs) Fig 5.14/ 4.14 Factors that affect the speed of conduction Diameter of the axon Myelin sheath Speed at which voltage-gated ion channels open Diversity in synaptic transmission Chemical vs. electrical synapses Structure of synapse Types of neurotransmitters Types of neurotransmitter receptor Evolution of neurons Fig. 5.1/ Electrical vs. Chemical synapses Fig. 5.26/ 4.26 Electrical vs. Chemical synapses Electrical Chemical Speed Faster Slower Directionality Can be bidirectional Unidirectional Same signal pre- and post- synapse? Yes No...
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This note was uploaded on 11/05/2011 for the course BISC 305 taught by Professor Christians during the Fall '11 term at Simon Fraser.

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lecture_10 - Reduces membrane capacitance and so increases...

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