UGA BIOL 1108 - Electrical Signals (7 pages)

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Electrical Signals



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Electrical Signals

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Pages:
7
School:
University of Georgia
Course:
Biol 1108 - Principles Bio Ii
Principles Bio Ii Documents

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10 9 14 Are your 100 billion neurons ring How to Communicate Coordinate Electrical Signals Lesson 21 BIOL 1108 10 October 2014 1 Unit Animal Form and FuncIon Today s Topic Electrical Signals Today s learning objecIves Be able to describe the range of vertebrate nervous systems describe informaIon processing idenIfy neuron structure and funcIon describe the basis of membrane potenIal 2 1 10 9 14 This is your brain This is your brain on colored proteins 3 B SEASTAR C CRICKET A HYDRA cnidarian D SQUID E SALAMANDER 4 2 10 9 14 Central Nervous System CNS Brain Peripheral Nervous System PNS Cranial Nerves Spinal Cord Ganglia Outside CNS Spinal Nerves 5 Sensory Input Integration Center Sensor Motor Output Effector Peripheral nervous system Central nervous system 6 3 10 9 14 Organelles 1 Dendrites 2 Cell Body 3 Axon Hillock Signals generated 4 Myelin Sheath Insulation increases speed Schwan Cell The funcIonal unit of the nervous system Neuron 5 Node of Ranvier Gap helps signal leap down axon 6 Axon transmits signal from cell to cell 7 Axon terminal 7 Figure 48 9 TECHNIQUE Microelectrode Voltage recorder Reference electrode 8 4 10 9 14 Membrane potenIal The charge di erence or voltage mV between the inside and outside of the axon Measured relaIve to the extracellular uid How is a negaIve charge built up inside the axon ResIng potenIal Between a60 mV and a80mV 9 Why is the axon resIng membrane potenIal a70mV Electrical Charge Active transport Net movement of K out of the cell since there are more K channels More diffusion out less diffusion in Pumps in more K than Na 3 Na out 2 K in keeps charge inside 10 5 10 9 14 Equilibrium PotenIal Eion when the electrical gradient opposes the concentraIon gradient a Calculated using the Nernst EquaIon a Depends on the concentraIon gradient EK a90mV ENa 60 mV E ion 62 mV log ion inside ion outside E Na 62 mV log 150 mM 15 mM 60 mV 11 WORKSHEET Experiment in Ion Flow Across Semiapermeable Membranes Experiment Potassium K Flow IdenIfy the



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