PSY 2301 Lecture Notes - Lecture 9: Threshold Voltage, Saltatory Conduction, Volt

• School: University of Ottawa
• Department: Psychology
• Course: PSY 2301
• Professor: Andree- Anne Ledoux

Document Summary

9 short answer quesions, 5 true or false, 27 muliple choices. What are the diferent steps in order to generate and acion potenial. Large, brief reversal in polarity of an axon (voltage around the membrane suddenly reverses: making the intracellular side posiive relaive to the extracellular side, polarity abruptly reverses again to restore resing potenial. Lasts approximately 1 millisecond (ms: threshold potenial, voltage on a neural membrane at which an acion potenial is triggered, opening of na+ and k+ voltage-sensiive channels. Acion potenial are a brief reversal in polarity of an axon. For a brief period of ime the inside of a speciic place on the axon of a neuron will no longer be negaive but will be posiive. An acion potenial is triggered when the cell membrane is depolarized to about -50 millivolts. At that threshold the membrane will undergo many changes with no addiionnal simulaion: opening of na and k voltage-sentive chanels.