04 - Neurotransmission- Action Potentials

04 - Neurotransmission- Action Potentials - Brief Recap:...

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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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The state of the neuron prior to sending a nerve impulse At rest, the membrane maintains an electrical polarization or a difference in electrical charge of two locations. inside membrane: slightly negative with
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This note was uploaded on 06/09/2011 for the course PSYCH 180 taught by Professor Ziegler during the Spring '10 term at CUNY Hunter.

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04 - Neurotransmission- Action Potentials - Brief Recap:...

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