PSYC326_4

PSYC326_4 - PSYC 326 - NOTE Communication Within a Neuron...

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PSYC 326 - NOTE Communication Within a Neuron Neural Communication: An Overview e.g., simple reflexes illustrating excitation and inhibition Measuring Electrical Potentials of Axons electrodes microelectrode glass filled with KCl membrane potential -70 mV oscilloscope used to amplify time and voltage resting potential depolarization hyperpolarized action potential takes about 2 msec threshold of excitation Fig. 2.17 p. 45 shows resting potential, increasingly larger EPSPs, action potential and recovery The Membrane Potential: Balance of Two Forces THEME electrical charge is a result of a balance of two opposing forces The Force of Diffusion diffusion e.g., sugar diffuses in water at 0 K (-273.15 deg C, -459.7 deg F) molecules cease their random movements The Force of Electrostatic Pressure electrostatic pressure e.g., NaCl dissociates in water into cation (Na+) and anion (Cl-) positive repulses positive, negative repulses negative, positive attracts negative Ions in the Extracellular and Intracellular Fluid
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This note was uploaded on 09/28/2008 for the course PSYC 314 taught by Professor Warner during the Fall '08 term at USC.

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PSYC326_4 - PSYC 326 - NOTE Communication Within a Neuron...

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