The Schwann Cell and Action Potential

[charlesbioful]

best explanation of the neuron of i've ever seen in my life. Narration skillz need a little bit of work though

[MrsPoker]

Nice, but no real explanation of why it's faster.

Comparing it to a train, or with 'tabs' instead of 'spaces' doesn't explain anything, it just makes it easier for the mind to accept.

[lolajohnson1]

awesome

[mizhotmaplesyrup]

Beautiful, simple, ez to understand explanation w/ gorgeous animation! Wow!

[aznnaruto777]

I understand the train example above, but can someone explain in further detail? Like does the action potential start and end (resting) at each node and start again in the myelinated axon or does the influx of sodium in the axon keep the action potential from reaching resting state thus causing it to continually travel until it reaches the synapse? Or am I completely wrong?

[PiinoySolja]

music makes me want to fall asleep.

[Gugguggug]

This video is very good, but I didn't think it is clear on exactly HOW the myelin causes or transmits the signal from one Node of Ranvier to the next. Thanks.

[vikasbr94]

awesome video

[raiamirr]

bst video about action potential

[chrissline77]

Action potentials are unidirectional, all or none waves of depolarization

[skinnimelon]

thank you

[dukelinius]

my teacher has a 78% pass rate for the ap test, with 4 being the most common score, and a 93% pass rate for the ib biology sl exam... but she's crazy and i dont understand half the things that come out of her mouth cause she assumes to much... this really helps

[SeMoTeMo21]

it's so useful !!! i just now understood it so thnx 4 this video

[jnice61]

very helpful



[R1Ritter]

 1.SEM Psych Uni Leipzig

Wow, danke für den Hinweis auf dieses Video!

[drsoha18]

like

[lindybindyify]

Best video out there! Thanks a milion! :)

[lindybindyify]

Best video out there! Thanks a milion! :)

[lunita01co1]

nice video

thanks

[Nijaman24]

Thanks



[Kufunklefec]

Could you just teach me the rest of physiology?

[Claudestclaire]

I don't understand why the schwann cell would want to attach itself to the axon, except for letting us function better in our world .. or is there actually a biological attraction?

[2StepMurder]

I love biology :)

[umreeta1]

Thanks for explaining....the Action potential

[msschawann89]

lol Thats how my name is spelled excepted it is missing another "A". Go figure

[VinkoRajic]

I can use telepathy, I am interesting to take part in research on it.

[Vlaglz95]

Awesome video I agree with Reminiscable this is better than be distracted by some video games : D!!!

[gwhyhate]

Very well done. Thank you for taking the time to make and post this. :)

[thatswhatcindysaid]

Thanks!

[samvanzeeland]

thanks a bucketlaod lady!

[92asina]

this was helpful

[LAxCECE]

WOOOOOOOOOOOOOW!!. it took my book one whole chapter to explain this simple little process.

[smurfman911]

It was awesome to listen to you swallow.

[cjcurry222]

Now I understand, please teach my Professor, lol

[WayneP2010]

Wonderful video! Thank you!

[DeadHelena]

I don't think the Na diffuse in, its more like rush in by flux due to the electrical potential created from the K channels. Diffusion is much to slow to cause a signal to be passes quickly.

[skeletorftw]

very informative, but monotone narration does not help.

[pirateXhunterXzoro]

I'm so confused at 3:55 - 4:20. Can someone explain in simple terms why myelinated axons are faster than unmyelinated? 

[PuraVid4]

@pirateXhunterXzoro The myelin sheath does not allow ions to exit/enter the axon. In a non myelinated axon, depolarization occurs at every step and the speed of the action potential down the axon is slow. In a myelinated axon, the only depolarization occurs at the nodes of ranvier and then the action potential is free to move down the axon until the next node of ranvier.

[PuraVid4]

@pirateXhunterXzoro Think of it like a train. The unmyelinated axon has 20 stations on its route and at every station it must stop and unload/load passengers. This slows down the total time the train is moving towards its destination.

The myelinated axon is a train with fewer stops. It only has to stop at a smaller number of stations (nodes of ranvier). This allows the the train to get to its destination faster.

[chrissline77]

@PuraVid4 ..........Hey, you did a nice job explaining that. I understand now because I read your explanation. Thanks!

[PuraVid4]

@chrissline77 Thanks I'm glad a post I made a while ago was able to help someone out :)

[verosun12]

@PuraVid4 if the whole axon was covered in myelin would it travel faster since theres no stops?

[PuraVid4]

@verosun12 Theoretically yes but there would need to be a Schwann Cell large enough to cover the length of the axon. The Nodes of Ranvier are actually the junction between two Schwann Cells (myelin).

[lonesomexheartbrokn]

@PuraVid4 Regarding @verosun12 's comment: Also, my textbook says that nodes of ranvier cannot be more than 1-2 mm apart b/c the cable properties of axons can only conduct depolarizations up to this distance.

[drsayedsamir]

this amazing really thank you

[ranechan]

Can someone please tell me the name of the song playing? or who it's written by?

[psipsychologytutor]

thank you ~:-)

[bizbert2000]

pfizer makes biological weapons of mass destruction

who wants some deadly geodon or whatever they really gave me

17089234000 free 24/7 terminal support related to any pc issues.

if it's ok what pfizer is doing ,using biolotgical agents against innocent civilians, hell let's just start launching all our nukes at eachother..

stick me with needle, after i tell u heart problems, and you mr nurse don't give a fuugk, donetingforabuck!!goto nursejim n dr beresford are murderers

[karamipayam]

go CAVALIERS. VIVA Johnson County Community College :* I'll miss you even though I love KU.

[TeleMentoring]

This is really helped and made abstractions of nerves very understandable - I know have an intuition of nerve physiology! Thank you

[kamakasi90]

cheers for that much better than my bio teacher!!

[shinaley]

Asian sugar babies  # lushfmlk.info#

[crazeedude2010]

@TheAlexacaius The chick sounds like she is doing an 8th grade Biology presentation while on a perscription of Cymbalta

[pillsburydourboy]

"axoplasm" is incorrectly captioned as "ectoplasm."

[MarconisRadio]

Beautifully animated. Well done.

[plmqas]

@jcccvideo you've said that teenagers have rapid respond due to thin myelin cover(0:36), then yoy've said that "thick myelin adventage is speed of propagation" (1:31), so I see there is little contradiction, and it seems that medium thickness of myelin sheat is optimal for speed of potential propagation

[haizram]

@plmqas Actually I believe she said that myelin was *thickest* in adolescence, which is why teenagers have such quick responses.

[ZagiEscobar]

2:15 Does anyone know what the stimulus is?

[FearTheCalm]

Can someone tell me why exactly it increases speed? Why does the action potential jump to the nodes of Ranvier? I know the Oligodendrocytes/Schwaan Cells act as a insulator, but that's about it...why doesn't the insulating material stop the electrical conductance? Is it maybe the sodium rushes to where channels are concentrated in the nodes of ranvier? =(???

[policefreakz]

what the hell is up with her voice?

[TheAlexacaius]

@policefreakz She does sound totally unbothered and uninterested in what she's saying, kinda irritating.

[thricekinep]

Tim and Eric say: "... Great Job!"

[TheHappyTissues]

Very Helpful....i know ima ace my Physiology quiz tomorrow

[idolgin776]

Nice video. I like the animations that illustrate the most important concepts and are not too flashy.

[upahe3]

this is great for students of ALL levels

[magicallypossible]

this is really amazing!! i like the light background music as well :)

[nancybox]

Thanks, I think this was one of the best and most informative videos on this subject that I have seen so far.

[NusfaHyder]

great video.......................tn­x........

[ZERO2217JACKY]

The best video I've seen so far!Even better than my biology teacher!!

[ShadowDragon534534]

@ZERO2217JACKY fuck i have to agree with that !!

[afiqwhiteshark2000]

thanx...mepians should thanks u!! from meg4..

[benjitarius]

great video!

[souvick87]

thankss :)

[dyepribudoy]

the rushing in and out of Na+ and K+ is not quite clear here.

[livingwellness1965]

great help with my studies...thanx and keep up the good work

[sotabel]

Very good video! (:

Congratulations for the animation and the script, you made me understand finally what is the treshold. (:

[aapho]

VERY usefull. it helped me alot, thanx.

[nickel24drums]

thx a lot

[Caramelstick22]

Very Helpful.Thank you!

[elementsdayspace]

Please make more of these! Very helpful!

[lebonillab]

Really cool!!!... this is really awesome and looks so professional.

[willrap4f00d]

The awesome music made this video very cool. Who did the SCORE for this? John Williams or Hans Zimmer?

[haizram]

Ha! Nothing so lofty. I actually made the score by looping some tracks in Garage Band. :-)

[preetk7]

thanks helped a lot with understanding the info lecture slides

[Reminiscable]

Watching this was more fun than playing videogames! I hope that my axons stay myelinated forever!

[sckryde]

just dont get punched in the jaw.

i took a hit from some drunk bastard and it severed a facial nerve.

i lost sensory systems

[jdcatch]

Excellent overview. Thanks!

[ikpraatmetpoezen]

Very useful, thank you!

[na1tashaa]

thats, it was really clear :)

[kaykentucky]

thanks for uploading on youtube =D helped A LOT!! lol i wish my lectures are conducted on youtube.

[akbarblanchet]

very good, but i would suggest speaking with more enthusiasm... i saw one video that exaggerated the enthusiasm (way way wayyyyyy exaggerated) and it was actually quite awesome. She made it sound exciting and new and interesting.. it was actually also quite humorous and i learned much faster. still, GREAT video nonetheless! Helped a lot.

[psychotheed]

Thankyou :)

[Snyblind]

Thank you. Helped a lot:)

[mehrshadpiano]

wow , it was very useful , thanks a lot . everything was s good , voice and animation .

[12nado12]

Thank you! Excellent job! It helped me a lot :)

[youlosez]

good info thanks

[MisterReallyCool]

so helpful, thank you

[DDA121]

This was very helpful... thanks!

[bruswan]

You have to love it

[ber1311]

This video gives me a clearer idea on the action potential across a myelinated neuron. Thanks. It helps me in my studies.

[LC212689]

Thank you for this video! It is very clear, and helped me a lot in my understanding of saltatory conduction!

[CALUCKYGIRL]

A good details of action potential

[messageofthemaker]

Fascinating!