4 Neurotransmission- Action Potentials

4 Neurotransmission- Action Potentials - HowNeuronsTransmit...

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How Neurons Transmit  Information
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Lecture Overview Electricity and Neurons The Action Potential Neuronal integration of information
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Brief Recap: Figure 3-11 Anions- negatively  charged ions Gain electron Ex. Cl - Cations-positively  charged ions Lose electron Ex. Na + , K +
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Ion movement creates electrical charge Diffusion: ions  spreading from more  to less concentrated  areas Concentration  gradient: the  concentration of ions  in a specified space Differences in conc. of  ions leads to diffusion
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What about electricity? Since ions are charged, they not only  move according to concentration but also  to voltage Voltage gradient: ion movement from area   of high charge to low charge Ex. NaCl in water Opposite charges attract  Similar charges repel Flow until equilibrium is reached
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How the Movement of Ions Creates  Electrical Charges   Modeling the cell membrane A voltage exists across the membrane when there is a difference in charge  between the two sides of the membrane Chloride Ion Channels Efflux: Outward flow Of Cl- ions Influx: Inward flow of Cl- ions
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Electrical Activity of a Membrane
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Resting Potential The state of the neuron prior  to sending a  nerve impulse At rest, the membrane maintains an  electrical polarization or a difference in 
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4 Neurotransmission- Action Potentials - HowNeuronsTransmit...

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