L03-MembranePotential

L03-MembranePotential - 1/25/07 Resting Membrane Potential...

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1/25/07 Resting Membrane Potential Review: Neurons o Neurons are specialized cells with dendrites, soma (cell body), and an axon (terminal boutons) o Info travels from dendrites to soma to axon and terminals (law of dynamic polarization: info flows in one direction) o Info flow within a neuron is electrical o Info flow between neurons is chemical Fun Facts o In 1 microliter of cerebral cortex there are 10 6 neurons, 10 9 synapses, and 48 km of axons o 1 shot glass = 40 ml o 40 billion neurons and 40 trillion synapses and 1.2 million miles of axons Bioelectricity: Membrane Potentials o All neurons have an electrical charge Inside is more negative than outside (electrical potential across membrane) Charge comes from a difference in ionic concentrations; charge is termed membrane potential (units in millivolts) The membrane potential at rest is called the resting membrane potential Ions in the Intracellular and Extracellular Compartments o Ions are found in each space
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This note was uploaded on 04/09/2008 for the course PSYC 220 taught by Professor Brunges during the Spring '07 term at UVA.

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L03-MembranePotential - 1/25/07 Resting Membrane Potential...

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