Sodium-potassium pump | Cells | MCAT | Khan Academy
ฝัง
- เผยแพร่เมื่อ 27 ก.ย. 2024
- Courses on Khan Academy are always 100% free. Start practicing-and saving your progress-now: www.khanacadem...
How a sodium potassium pump can maintain a voltage gradient across a cell or neuron's membrane. Created by Sal Khan.
Watch the next lesson: www.khanacadem...
Missed the previous lesson? www.khanacadem...
MCAT on Khan Academy: Go ahead and practice some passage-based questions!
About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.
For free. For everyone. Forever. #YouCanLearnAnything
Subscribe to Khan Academy’s MCAT channel: / @khanacademymcatprep
Subscribe to Khan Academy: www.youtube.co...
POTASSIUM. POTASSIUM. POTASSIUM 9:02 9:41 9:43 10:08 10:18 10:23 not sodium
Good looking out
I am a hardworking man 8-)
Sean Ngui thank you..I picked that up, which means something is making sense. please do a new one Mr Khan.
Thank god i am not the only one; I was losing my mind!!!!
ikr
I'm learning more on TH-cam than in school for 2 reasons: 1) Visualization of information in an entertaining manner; and 2) Predisposition to learn (I choose what I'm interested in learning). This is the future of education.
07:25 Instead of "phosphate groups" it should actually be Na+ that gets pumped to the outside.
you said sodium ions in step 5 when it was supposed to be potassium
Yes I saw that! i'm not going mad :D
You mix up your solutes many times. First you say that you pump out 3 phosphorus when you meant sodium and then you say you pump in sodium when you meant potassium. Otherwise, really appreciate the video.
These videos are all truly great, but this is the second one in which you have said "sodium" when you actually meant "potassium." Please be more careful!
thats why he made a correction video on it :)
Why would i read my biology notes when i can just watch this :D Thanks for making my life easier in biology!
He made a few mistakes with naming Na K and K Na. He also called the Na in the second pump he drew to the left Phosphate,but he explained it very well.
what does he use to make these videos? It looks really fun!!
Nice Video How a sodium potassium pump can maintain a voltage gradient across a cell or neuron's membrane That You Share , So Very Nice Thanks You
i cant believe how much sense this makes ! your are the best
Cheers mate, i'm a year 12 human bio student from Australia, about to do a test on this tomorrow and was so confused up until now. Your fantastic at explaining and i'm going to forward this video on to all my friends as we are all so confused. Thanks man! i really appreciate it :)
yes, he said anywhere along the neuron that isnt mylinated. So yes you would find it on axon (nodes)
yup, its sodium ions that are released outside the cell, and the phosphate is released inside the cell simultaneously =P
Crystal clear (except minor errors) - thanks. TH-cam is 'king marvellous for study!
I agree, but for specific reasons. Although a good teacher will explain this equally well, TH-cam has these benefits: 1) you follow the explanation at a time of your own choosing, 2) there's less to no interference by classmates, 3) you can pause, repeat at will.
my god frank zappa is alive and teaches about neurons!!
Your videos are fantastic, a great tool for gaining in general biology knowledge
This guy explains things better in 14 minutes than my lecturer does in two hours
Look up Synapses, I think that should give you the general idea. Basically the action potential opens Calcium channels and this leads to Neurotransmitter (or even Hormones maybe?) being released outside the Neurone, converting the Electrical Signal into a Chemical Signal.
yeah obviously its a fantastic video and me aswell appreciate this man...i was also confused but now its fine......
My tutor yayy! Thanks Khanacademy
Thank you BigEdJon, that makes a bit more sense to me now.
You're a genius.
I LOVE the way you explain this......thank you so much! I would LOVE to take your class.....do you teach in Chicago? LOL have a great day!
Khan academy is awesome 👍
There are so many mistakes said in this video. You should redo it.
AWESOME VIDEO....helped a lot fr my xams!!!
He said sodium instead of potassium and since i hardly understand this i was going to lose my mind until i read the comments
Thanks.. Its a great help. God bless u!
thanku veryy much sir.. God Bless you
How many other people gringe when this guy says Sodium as he writes K and Potassium as he writes Na!!
Michelle Anderson "gringe"?
@nafizkarim he should really check back to this vid and annotate the mistakes. if it wasnt for u i wudve got mixed up, thx for the corrections :)
Wow this is really great
Thanks for the info
I understand it now
This is explanation of Re-polarization to resting potential
I actually learned two things. The sodium/potassium pump and how a volt meter works :P Really effective vids man. :)
You mixed up your sodiums, and potassiums a little bit but great video, very helpful!
saal keeeeeep it up.. ur a gr8 teacher
thanks alot Sir ! God bless u
Brilliant...Thanks!
This video was super helpful, thank you!
Thanks a lot!!!! You're awesome!!!!!!
@nafizkarim poor guy he kinda just got a bit unattentive for a sec you guys , he was making it on purpose to see if you were paying attention,LOL, the videos are AWESOMEEE :D i love the one of the krebs cycle.
To those of you about to fail your tests, I salute you.
u said the phosphates are pumped outside it's the sodium
I really appreciate uploading this video! It is really helpful for my biology test!! Really, thank you soooooo much!
i think there is also another error at the beginning, Dentrites is not a sender is a reciever !!
I love your videos but could you please make an video about biological membranes relating carrier proteins, channel proteins, diffusion etc. thank you !
too many mix ups.
these videos are great! thanks for the lesson i feel like i understand more now!
Thanks! the videos I was watching showed repolarization as only K flowing outside the membrane, bud didn't explain how the k returned inside to polarize the cell again. It's the Na/K pump!
thank you
Previous Video on this series: Anatomy of a Neuron
Next Video on this series: Electrotonic and Action Potentials
Great Job! Love your vidoes!
i love you mr khan
Please be careful and attentive. Don't teach the wrong things to people.
@ 9:04 we have 2 POTASSIUM not sodium ions bond to the "pump"
Sad but so true!
Thabk you so much omg
i have one question, along the path of the neuron, how/where is electrical signal related to chemical signal ?
Hi! Can you describe a simple experiment, explaining the contribution of the pump to the membrane potential?
Everytime he says "cell", I hear it as "Sal".
sir,the video is very useful in understanding about the sodium potassium pump.But there is 1 mistake in recording,when you explain about two potassium ion by mistake you say that these are sodium ions,overall the video was good.
what does it mean to have a negative voltage?
yes
if you say that the main reason of negative resting potential is the high resting permeability of K+, what happens when K+ in the blood goes high? As I know, the K+ might even enter the cell but it (the cell) becomes less positive, but still remains negative, for example at - 60 or - 55 mV. how to explain this negativity in this case?
Khan Academy has only been up since 2006, and it already has 3518 videos on TH-cam, that's almost 1.5 videos a DAY. How does one man learn this much!
That's what I was thinking.
Why would the Sodium ions want to bind to the receptor site of the (orange) protein in first place if the inside is less positive?
Positive-Positive are not attracted to each other.
Someone please answer that. Thank you very much.
So the signal is received at the dendrite right? Does this electrical potential gradient exist from the tip of the dendrites, through the soma (cell membrane), down the axon and to the axon terminals? I thought that the gradient only existed on the axon and the signal traveled down the axon when the signal gets to the axon hillock. Maybe I am missing something...can someone help?
yeah the sodium and potassium are backwards at times
do you have anything else on active transport????
First of, thank you for all the awesome videos! I had a question though, it resting potential -70mv or is it 90mv, or is it between the two?
When does ADP dissociate from the pump?
Good vid
Would this be classified as resting potential?
What happens to a cell if Thallium (TI) binds on it instead of potassium?
(It's known that TI got a higher affinity to the cell than K+)
The cell gets bigger and bigger but I don't know why...captain!
sad but so true
what program do you use to draw all that, it's such an interesting program.
So ATP is not required to change the protein back to its original shape?
What are the things that affect the na/k pump activity?..
Today my exam😓
Is there no dephosphorylation?
Step 4: He states that we have 2 Na+ ions bonding, but he writes down 2 K+ bonding...
But, doesnt a neuron actually hold data other than the superposition of the stimulation waves? how is that data such as a memory of how to carryout an action stored and stimukated when in need of carrying out the action?
Fissle Wine sorry im late.
but the reason why a neruon does not carry memory or any genetic material is because it does not synthesis tRNA so it can not go through the DNA replication process.
Help!!!!!! Does the Na+\K+ pump works during the action potential or only at rest?
still a little confuse.
what occurs during the resting state ( such as specific ions inside and outside the neuron) i know that part, but what is the voltage inside the neuron during the resting state?
that awkward moment when you realize that You Tube is more useful than school...
story of my life
10:07 is that Sodium mate!
Holy crap do you study this at age 12??!?!
@oXProskillzXo microsoft paint, It can do wonders!
Potassiu Khan Potassium, not sodium around 9:00
why is this video under Standard TH-cam Licence instead of Creative Commons?
I thought the more positives outside wanted to balance out the less positives inside. Due the the copious mistakes I'm more confused as ever X.X
Well, naturally that what the molecules are expected to do, in term of moving from a high concentration to a low one. However, the cell, especially the neurons do not want or need to do that. They keep pumping the sodium ions outside, and the potassium ions inside for many reasons, like maintaining electrical potential differences and electrical pulses transmission what so ever. And that is why we use ATP. The molecules are moving against their concentration gradients (low to high).
what school did u go to?
Kahn vids are usually pretty good . I had to stop watching this one after the repeated mistakes of saying sodium but writing potassium. Dude, check yourself!
lool I thought that I was going crazy
does anyone know hat software/hardware is used to produce these videos?
on step 5 u r writting K ion but keep saying sodium ions..it is really confusing
potassium not sodium 10:12