Membrane Potential

[bsm00061]

Na/K Pump is not the main mechanism used to maintain the concentration gradient.

[thezodiac8973]

care to explain leak channels -_- i just dont get them

[hernanadez10]

thumbs up for all the nursing majors!

[missliketoeat]

I'm in nursing school right now and this video REALLY helps me to understanding the purpose of having sodium and potassium in the body! Thanks for making this video!!!

[westsidemuderfukerr]

8) What phase is represented by the large scale movement of sodium ions during the change in membrane potential

[04kecia]

da voice was good

[04kecia]

im feel shocked

[waterfiltersystems1]

good video

[silverally]

he sounds like artie from glee !

[dkonu2b]

Exactly the refresher I needed. Thanks

[jonny0882]

Clear Speaking!

Even I am can understand it! thank you a lot ;)

[LekhaMusic]

sorry but i dont understand still lol.

[parodiasparaestudar]

/watch?v=RlSXDx9qn7g Paródia da música Alejandro da Lady Gaga, que fala dos processos de troca entre célula e o meio externo."

[zakgarofolo]

Nicely done!

[Japarmas]

Hey....just to say 'hi' and thanks once again. I think you should reconsider your career in medicine and perhaps look at lecturing? :-). Hope you're keeping well... X

[mazas1991]

1:29 -----> THE POTHATHIUM (potassium)

[mazas1991]

1:28 -----> THE POTHATHIUM (potassium)

[mcimmah]

Good Work... Keep it up. At least He Distinguished between Primary and secondary Active transport and emphasizes on the 'leak Channels' unlike videos...

[SilentMist09]

indeed, normally Potassium is 100 times more permeable than Na. Guyton and Hall proves that. :)

[thadea]

Sodium brings his trouble making friend glucose to the scene...

[kooziejr]

u got it wrong

[AntiMagnetMan]

You could do more of these young man. Very clear, thanks.

[mimi0291]

mimi0291

thanks that was very helpfull

[vRubennnv]

da wel, het ander was beter , celbiologie rocks!!!

[TimGeenhoven]

Stom filmpje

[Chilled2m]

This, truthfully, is not a very good video. The resting membrane potential is mosly decided by the permeability of the membrane to K and NA. The permeability through "leaky channels" for K is around 75 more times more permeable then NA. Therefore, The electric gradient is established when K goes down its concentration gradient, casuing more positive charge outside of the cell. The NA/K pump only contributes to 20% or resting membrane potential

[mcimmah]

@Chilled2m Pls get me sources...

[jenny07la]

@Chilled2m Thank You for the explanation!

[towhichwayout]

@Chilled2m Thanks for your comment that the pump only contributes to 20% of resting membrane potential. But doesn't the pump - as the guy says at the beginning - create the chemical gradient that the leaky channels' contribution to membrane potential relies upon?

[ahmetcorak]

@towhichwayout The origine of the negativity inside the cell is the anionic substances like proteins, organelles, phosphate ions, and nucleic acids which cannot go out of the cell. Potassium here in the cell to neutralize, though partly, this negativity, however its tendency to go out (leakage) contributes the negativity inside the cell.

[ahmetcorak]

@Chilled2m The NA/K pump contributes much much less than 20% of resting membrane potential. For instance if the resting membrane potential is -90 mV, the contribution of this pump is only -4 mV

[jdcatch]

Nice work!  Thanks!

[Baydhaba11]

thank you

[hotmonkeypunk]

i thought the concentration was the other way around. sodium is higher inside, and potassium is greater outside.

[ThatstheFunk]

@hotmonkeypunk no, the sodium is greater outside of the cell and potassium is greater inside. sodium does not enter the cell as fast as potassium leaves the cell. also, the membrane is about 75 percent more permeable to potassium than sodium, causing there to be more sodium outside.

[ndnapollo]

no.

[xXxobviousxXx]

thank you!

[vaugnr82]

this, despite the lack of aesthetic appeal, is probably one of the more informative videos on this subject that I have seen. GJ! Keep it goin

[minisquirrel]

Thanks

My cell bio class is covering this topic and I was really confused, but now it's all clear. =)

[evankiefl]

why does the cell want potassium? and where are the sodium ions coming from inside the cell?

[sporks4all]

Not bad, not bad! Thanks for the info, every little bit helps on this subject!

[MsGrammarnazi]

Cool..

Thanks

[BlueRain1127]

omg... so i just had a major lightbulb moment thanks to you..... i have been completely confused about this for weeks. Thanks so much!! A+

[Shikalocura]

thank you (L) :*

[ppd2000]

nice work brother

[jgalvan87]

Perfect, Cell Biology Rocks

[niobe00]

I kind of don't get the glucose thingie... it's confusing :( I'm writing a test on this on monday, I'm screwed... maybe I just don't get it cuz English isn't my native language xD in germany, Na is called Natrum and K is called Kalium, which makes much more sense then potassium and sodium... or, it is easier to remember, at least.

[drgrimaldo]

Bastante bueno,  facil de comprender... Gracias

[zanecha]

Yeah, it would be useful if he talked more about the outside of the membrane being relatively positive compared to the inside. Buy hey-ho, it's good none-the-less!

[jaaaaaaime]

nice and clear! thanks =)))!!!

[xxBEKAHxCHANxx]

thank you very much :D

it was extremely helpful :)

[laura85elizabeth]

thanks for posting, this is really helpful - i have an exam on this in a few days

[zanecha]

I got an A in mine :P \o/ 31/34

[Venusdelicate]

Very nice explanation of cotransport and sodium potassium pump.

Dr. Biswas

[harriswhistles]

Miraculously complex cellular functions! Do all living cells have this characteristic (more K in the cell than outside)?

[zanecha]

To my knowledge, yep. But you also need to understand that the K+/Na+ pump, during the resting potential maintain the charges both out and inside the cell by expelling Na+ that can "leak" in through the protein channels and also that potassium is taken back in case of leakage.

[drskinnerve]

Very nice demonstration, but I was confused what the glucose transporter has to do with the maintanantce of the membrane potential...

[hnsaghire]

this animation is nice, but it must be stated at the end that there is no net movement of K ions bcz of the balance between the electrical force and the diffusion force.

[cjmurphy111]

"In living cells the concentration of...potassium is much greater inside the cell than outside." How can this be if there is no net movement of potassium ions?

Great little video, very clear. Probably not of interest to minors, more undergrads in the life sciences. Way to go, biophysicists of the world unite!

[usman2hype92]

nice explanation but would probably be a bit confusing for minors. they probably don't even know whats what