UT Arlington BIOL 3322 - electical transmission (3 pages)

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electical transmission

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electical transmission


understanding and measuring electrical transmission

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Lecture Note
University of Texas at Arlington
Biol 3322 - Brain and Behavior

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BIOL 3322 1nd Edition Lecture 5 I II III IV V VI VII VIII IX X XI XII XIII XIV XV Neurons can convey info as a wave induced by stimulation on the cell body traveling down the axon terminal Neurons are testing on squids have giant axon that is much larger than humans Tools for measuring a neurons electrical activity a Oscilloscope super sensitive volt meter b Microelectrodes Definitions to know a Cation positively charged ions b Anions negatively charged ions c Diffusiond Concentration gradient e Voltage gradient gradient involving and charges f Electrostatic gradient Equilibrium reached when concentration gradient equals voltage gradient Resting potential electrical charge across a resting membrane creates a store of potential energy will not fire At rest inside of cell is with respect to outside of cell or outside of cell is with respect to inside of cell 4 charged particle take part in producing the resting potential a Ouside cell Na Cl b Inside cell K large proteins Maintaining resting potential of inside with respect to the outside a and charged ions are distributed unequally b Achieved by channels in membrane i K channel k can enter and leave cell freely ii Na channel gated Na cannot freely pass voltage gated iii Protein in membrane Na K pump exchanges 3Na for 2K ensuring that there s a disproportionate amount inside cell requires energy ATP to ADP Graded potential a Hyperpolarization efflux of K to extra cellular fluid or Cl to ICF intracellular fluid b Depolarization influx of Na channels into ICF Action potential Threshold potential change in voltage along axon the most charge it can take before action stimuli is seen Refractory period nothing can cause a cell to be activated stimulated Know action potential graph be able to draw and explain Nerve impulse a EPSP excitatory postsynaptic potential b IPSP inhibitory postsynaptic potential These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your

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