Section1-4 - 1 Action Potential V-gated Na + channels:...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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....
View Full Document

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.

Page1 / 4

Section1-4 - 1 Action Potential V-gated Na + channels:...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online