Week_2_Lecture_5_Neural_Communication_1_

Week_2_Lecture_5_Neural_Communication_1_ - Neural...

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Unformatted text preview: Neural Communication: Part I Outline Communication with a Neuron Action Potential Conduction of Action Potential Communication between a Neuron Synapse Neurotransmitter Release How did that happen? Message transmitted is an ACTION POTENTIAL Starts Junction of axon and soma Travels down axon to terminal buttons Electrical potentials of axons Axons have two basic electrical potentials Resting Membrane Potential This can change : depolarization, hyperpolarization, and threshold of excitation Action Potential Temporary disturbance in electrical charge across membrane of axon Resting membrane potential: -70mV Depolarization and Hyperpolarization Resting potential ~ -70 mV Threshold ~ -55 mV Action Potential ~ +40 mV ALL or NONE Hyperpolarization ~ -90 mV Resting potential ~ -70 mV It all takes approximately 2 msec! Maintaining membrane potential diffusion gradients electrostatic pressure dynamic equilibrium Diffusion diffusion gradients move from high to low sugar dissolving in water Electrostatic pressure electrostatic pressure substances carry charge...
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This note was uploaded on 03/19/2011 for the course BIOL 140 taught by Professor Dr.joshneufeld during the Spring '10 term at Waterloo.

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Week_2_Lecture_5_Neural_Communication_1_ - Neural...

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