The Action Potential | Myelinated Axons

Action potentials are exciting all-or-nothing events in neurons, where a membrane depolarization becomes self-reinforcing and quickly travels down the length of axons. Action potentials are neurons' solutions to passing electrical messages reliably, without fail.
This video introduces how voltage-gated ion channels and their positive- and negative-feedback loops explains the characteristic shape of action potentials. They are described quantitatively by the Hodgkin-Huxley equations.
Neurons have a need for speed, and it turns out that even action potentials do not travel quickly enough down long axons when a very fast response is necessary. The second half of this video derives two different solutions from the Cable Equations to speed up action potential propagation: giant axons (if you're a squid) or myelinated axons (if you're human, and you probably are).
Playlist for all videos in series: • Introduction to Neuros...
Professor Bing Wen Brunton
www.bingbrunton.com
@bingbrunton on twitter
%%% CHAPTERS %%%
0:00 Passing messages without failure
3:20 Voltage-gated ion channels
6:20 Steps of an action potential
12:43 Key concepts for action potential
16:30 Hodgkin & Huxley
26:35 When voltage-gated channels go wrong!
32:48 Action potential travel IN SPACE
37:45 Myelinated axons are fast
48:25 When myelination goes wrong!
50:37 Key concepts and summary

[@BlueBirdgg]

Ty for your videos. Watching the playlist!

[@papersitry]

Hello Doctor, I am a Coder since 1969, and I'm learning a lot from your lectures. If there is anything you want me to do, any code, implementation, deployment, I am your man!! My son is little, but he's a Coder too. So we both are volunteering! ❤️ Stay blessed teacher! ❤️

[@pacoramirez2714]

I really hope this series keeps going, I'm learning a lot!

[@BCarli1395]

What a nice graphic effect at about 50 seconds in-“time” arrow turns into a filament of spider web.