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Unformatted text preview: 1 Action Potential V-gated Na + channels: Threshold , All-or-none activation Return to polarized state required to reactivate: refractory period Na + channels open (described later) Voltage-gated Na + channels open V-gated Na + channels close Voltage-gated K + channels open Voltage-gated K + channels close Na/K pumps put things back in order Threshold Na + in K + out http://www.blackwellpublishing.com/matthews/channel.html ht p:/ highered.mcgraw-hil .com/sites/0072495855/student_view0/chapter2/animation__how_the_sodium_potassium_pump_works.html Channels allow ions through the membrane During an Action Potential , channels open and let Na + in and K + out Neuroscience for kids ht p:/ faculty.washington.edu/chudler/ap.html Once started, opening of Na + channels in chain reaction down axon (all-or-none) Size matters : Thicker is faster Sheathing ( myelination ) also matters: A type of glial cell Essentially layers of fat, insulation In Myelinated axons, action potential can “jump” down axon.In Myelinated axons, action potential can “jump” down axon....
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This note was uploaded on 04/09/2012 for the course EXP 3202 taught by Professor Staff during the Spring '12 term at Florida State College.
- Spring '12