Electrotonic and Action Potentials

[torleaful]

My prof told me if anyone had a better way to teach this concept we were to tell him. I feel like emailing him the link to this video aha.. thank you so much. You're making a tired physiology student a lot less confused.

[22snus]

Legit 

[789123Y]

Where does the cell get all the ions?

[Kail1Kain2love2]

I had to watch 4 videos on this before I finally got what's going on thanks to your video. I kept wondering why Na+ opens; its very hard to visualize because there's so many things going on at once and alternately as well. THank YOU!

[Mjhond]

I am very happy to see the vidoe after you give this How electrotonic and action potentials propagate down cells

[Mjhond]

I am very happy to see the vidoe after you give this Electrotonic and Action Potentials

[Ondelendo]

I Love The Video It Can Increase My Knowledge How electrotonic and action potentials propagate down cells

[anakmudajaman]

Steady I Really Like This Video How electrotonic and action potentials propagate down cells

[bebeheuy]

Good, I like that you share this video, I wish success always How electrotonic and action potentials propagate down cells

[imegatrone]

Nice Video That You Share , So Very Nice Thanks You How electrotonic and action potentials propagate down cells

[willamricard]

I Really Like The Video From Your Electrotonic and Action Potentials

[bundawartini]

Your Video Is Very Useful Sharing Electrotonic and Action Potentials 

[bundawartini]

Your Video Is Very How electrotonic and action potentials propagate down cells Useful Sharing

[khijasmith]

brilliant video

[protestukr]

16:36 "...this first DUDE" xD

[PsychoXuAn]

Other than the confusion of Na+ and K+ names, its really good :D

[jayejayeee]

really informative and interesting

[yando66]

Good lecture, but I'm not sure "More energy" can be

attributed to APs versus graded potential. Maybe more

complicated or more extreme, more "all or none." Remember,

the ion channel opening doesn't require ATP, and the K+ and Na+ ions

flow downstream.

The pumps do require but they are slower.

[TheLeporad]

lol, fail at 11:34

[Telepcanin]

So what would you say exactly say when somebody asks you what is electrotonic potential?

[Mohamedjm]

So guys, he said that the electronic potentail is faster than the action potential...

But what I was thinking is this:You can look at the action potential as "poly-electronic potential",I mean you can look at it as many electronic potential processes very near at each other, that leads me to the idea, that, when its many electronic potentials near each other, then its gonna be even faster than one electronic potential, so fast with fast is even faster. so how come action potential is slower? Thx

[bisoulula]

is electrotonic potential another term referring to a graded potential?

[myronez]

@bisoulula i believe so

[ballin85]

dude all of these videos literally have made me twice as smart. thank you so much!

[JeanneChu828]

Love it! That's amazing.

[vestraya]

lol 11:33

[vestraya]

so where does electrotonic potential happen and why?

[KingEskavar]

so only one type of gate should be able to open according to its neighbors or you would have it bouncing between -55 and +40 because of the na+ gates rules...

right?

[childmagic1]

THX SO MUCH MAN.....EASILY UNDERSTOOD

[TeKNiQ50]

Could you do a video behind the electrophysics of action potentials? :)

[awoodson89]

If I had been watching this in a mirror, I think I literally would have seen a light bulb turn on in my head. Please don't ever stop making these vids.

[gwhyhate]

Thank you SO much for taking the time to post this.

[Zhangsiping]

Thank you very much for your illustration!

[92rachh]

@khanacademy thankyou so much for these videos; they have been so helpful in first year biomedical science! a quick question, are electrotonic potentials the same as graded potentials? and also, are graded potentials basically action potentials that don't reach threshold (and hence comes in the spacial and temporal summation, and the fact that they're localised, etc.)? thankyou! :)

[XCrystalXMoonX]

This video explains so much. I was really struggling to understand this part. I could never thank you enough, but THANK YOU!!!!!!!!!!!!!!!!!!!!!

[maiisel]

you said Sodium when it's meant to be Potassium.

[gokusonic92]

whenever the lecture class starts..... somebody please give their thumbdrive to the lecturer and play it for 2 hours long.... AND YOU WILL GET A++++.....

[08dressageGal]

ahhhhhhhhhhhhh this helps me for my mid term tomorrow!! thank you for being born with a brain bigger than Einstein.

[shorttypants]

Salman Khan,

I truly appreciate all of this work that you do and for the Khan Academy. After failing to understand this concept for 2 hours of reading books, lecture notes, and online articles, I can finally understand action potentials and neurobiology at the level that my class is being taught at. You are really are doing a service to society and I really hope that you continue your efforts to educate the world.

[lisapark649]

Please don't ever take your videos down.

[mate6007]

Nothing better than learning in High Definition.

[jujubeans360]

You did NOT forget to be awesome, KhanAcademy!

[fadddy2]

god bless your soul khan academy your going to heaven for this

[fadddy2]

god bless your soul

[Livinglifehigh]

so i've never heard of elctrotonic potential. we only use graded potential and action potential. is Graded potential an other terminology for Electrotonic potential?

[ThePolo1981]

I wish i was your student :) Great Video Thanks

[msmello30b]

Wow! This was excellent! It was like a real field trip of the nervous system! Oh how I love youtube. 10 thumbs up! I will be back often until this soaks and I am able to explain. I hope this guy have other Anatomy & Physiology topics for discussion. You rocks!

[noahnz]

Often people talk as though somehow the only diffusion gradients/chemical gradients (they're the same right?) that matter are those of one type of molecule. In this case, there is a higher concentration of sodium outside the membrane. But isn't the tendency to move down a chemical gradient caused by the probability of collisions? If so, why don't we look simply at the concentration of molecules outside the membrane rather than the concentration of sodium outside the membrane?

[perioendo]

@noahnz Diffusion gradients and electrochemical gradients are not the same.

[captainmorgan76]

very useful!! I learn by seeing things, not reading text so this has really stuck in my head! THANK YOU!

[127miles]

CAN YOU BE MY PROFESSOR

[Gzorz]

I didn't know I could learn so much so fast. My head has exploded.

[Addii993]

i wish my teacher could explain this half as well as you.. she didnt even go in this but still tested from it on the midterms

[Rachael251314]

what about decremental conduction in the dendrite? it was said to be the powerful effect in inhibitory synapse at the initial segment of axon. I don't understand at all.

[ncoleman1973]

Would be interested in preparing a video on the nerst equation with respect to eletrotonic potential

[Js5s141]

Perhaps it's just me, but i don't really see the huge difference between action potentials and electrotonic potentials?

[batmaing]

@Js5s141 Yeah. The only real difference is the density of ion gates. For electrotonic, the gates are farther apart so the effect (from weak stimulus) dissipates before it has a real chance to affect anything. For action potentials, the gates are densely packed so the influx of ions is guaranteed to affect another ion gate.

[deadbilly]

Great video, but like the last one, you start calling K+ sodium. The chalkboard is accurate, but the names become sort of haphazard and confusing...

[juraad]

@deadbilly Yeah, in the end at about 14min

[ebonyamberjade]

Yeah I wish I had your brain too lol. This was pretty complex. I don't really understand electricity or millivolts or any of that so I might have to watch this a few more times for it to sink in

[ecaep86]

DUDE! I wish i had your brain lol

[XpliciTTRecords]

@ecaep86 just use what you have been blessed with and push yourself and you won't desire his brain, because you would have explored the corners of your own.

[lolitaforever333333]

@ecaep86 same here to pass my exams

[Ophiuchus123456789]

@ecaep86 surfer zombie

[icheapmarketing]

@ecaep86 You can have Brain like Salman but you need to work hard, smart, intelligent, make your schedule very flexible!