Introduction to cellular respiration | Cellular respiration | Biology | Khan Academy

[@izzynobre]

I literally didn't even finish watching the Report. I went over to the site thinking this whole online academy was a neat idea, and started finding videos about the topics I need to study for my test next week (pity I only found out about the Academy today). It's 1:56am and I'm studying Biology on the web for free. THIS is what those visionaries imagined the Internet would be one day.

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izzynobre care

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OMG I just realized I was just 8 when u posted this comment... kinda weird

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olha o izzy aqui hahaha

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@@neuva_2117 same

[@arese-]

Here 10 years later doing the Same thing. This is actually now integrated as part of my college curriculum (bio)

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I seriously think you should get a Nobel Prize, you've changed education forever

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Agree!!

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MITOCHONDRIA IS THE POWER HOUSE OF THE CELL

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my teacher gave me a detention for saying that

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AHAHAHAH

[@gracekuo8708]

@@chefoc1584 fr AHAHAHAH

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That is incorrect

[@Cod4Wii]

Very important, thank you

[@alvinliu8756]

who else was watching Crashcourse before this and because they didnt understand it, clicked on this video.

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panquake ayye

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Yeet

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Me

[@phenyo_4939]

Me. That was too complicated

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ayyyyyyyyyyy i just did that lmao

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We're all screwed

[@LXXIV666]

ye

[@danpt2000]

did you flunk the test?

[@angelaong1803]

danpt2000 I think I am going to. have test on that tomorrow and can't understand what my teacher is saying.... 😓😓

[@spectroxis6418]

*Laughs at above for being idiots.* /\

[@OmegaLink]

I agree

[@jenniferg7714]

Studying & learning for 'visual learners' has become so much better with mainstream internet use and great videos like this. Thanks for simplifying something which is initially quite confusing:)

[@jokkerdagoat]

watching this because of finals anyone?

[@aasnathrafeeq9672]

yea its a saviour ofcos

[@matz230]

Ha. Im doing this because of a middle school project.

[@dg798]

It's easy if you firm a chart in your mind and learn it

[@maryamalmahzaa6703]

Ya mine is tomorrow

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This professor is the best!!!! I hate online classes but I would rather take his online class than in person because he is just THAT GOOD!

[@jessica6470]

MY TEST IS TOMORROW! I'M TOO YOUNG TO DIE!!

[@SWonYT]

Why did no one politely tell this girl it was the wrong "to"? Yall wrong for that.

[@gothgirl1331]

Jessica Zhou sameeeee

[@sophiadelgado9754]

Sammy Williams She used the right "to"

[@JMANGREEN]

MY test was today

[@SWonYT]

@@sophiadelgado9754 you're right, I read the comment as "my test is tomorrow I'm going to die" because I thought it was a typo. My bad😂

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bro your videos make education easy to access now i don't have to spend hours trying to find a synopsis for my exam. Y'all really do deserve something special.

[@Adamolson]

Anyone watching this before a test😂?

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Everyone basically 😂

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😔😂

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Mee😂😂

[@moisesaguirre9453]

I got a test in 20 min 😂

[@Itswarmmy]

I always do this technique

[@kayelem23]

I might be one of the rare ones that isn't here for my midterm! I'm actually studying Biology at university and I tutor highschool students. I wanted an example for an introduction because I wasn't sure how to start... I might just make her watch this video, she won't need me anymore! you're amazing :)

[@jakeaintscary]

Thank you so much for taking the time to make these videos. I am taking an EMT course and have been memorizing all the information so I can pass the test but never really understanding how it works and after watching these videos it is all starting to make sense ^.^

[@bethy081989]

Got a 90% on my exam and you cut my study time in half providing me with more study time for other classes. Thanks for the download info as well. You are awesome and very much appreciated for the videos that you make. Thank you.

[@lexingtonchick1]

Best video on Cellular Respiration 👏🏽 thank you! I finally understand it! For anyone to understand this start by 1. Understand the basic understanding of Enzymes for catalyzing the chemical reactions of life 2. Watch the amoeba sisters on this topic 3. Then come back to this video and everything makes sense 😂😂😂

[@JoudAlgorain48930]

realll

[@TooooooooooNify]

I'm so happy i actually used his videos. I had my midterm today and professor added 3 essays and one of them were on this topic! and 50 multiple choice ... and some true and false.

[@aliciajohnson8367]

Super helpful video! I sat down to watch the cellular respiration series thinking that I would be cramming for my cell bio exam tomorrow but it turns out that I already knew the stuff,, i just needed a simple and clear expaination and this was it! I don't think many professors know how helpful it is (especially to adhd students like myselft) to just explain things in the simplest terms and expressions. I just love how concise and exact your lessons are. I know it can be good practice to have to use critical thinking skills to reach conclusions about topics like this but i find that style of teaching to be my weakness. anyways thanks a bunch for these great videos! If i wasn't a broke college student i would surely provide a great donation!

[@blackaliensheep5619]

You're the best! I didn't even get what the teacher was talking about I thought I was dumb but NO! I actually am not dumb!!! You're the BEST!!!! You're my teacher now!!!

[@amirajaber4149]

Test tomorrow, I can't stop ✋ procrastinating. I need to focus

[@onlyonemitch5049]

I thought Indians didn't procrastinate

[@emmaj8337]

I find that watching videos like this is the happy medium of learning. (So is teaching in a class while writing on the board, if the teacher does it well, i think.) Reading from a textbook is energy-draining and difficult. Listening to a lecture can be boring and you can miss details. But listening *and* reading, looking at the notes and listening to the explanation, is like reading along to an audiobook; it makes a lot of sense, and doesn’t require that much strain or cause confusion. Thank you for all the help. I hope you know you’re a *literal blessing* to us all

[@mxstrisha]

Sal, watching your Biology videos saves me a lot time and I actually understand all these subjects better. I'm sure I'll do good in my Biology finals tomorrow because of you. (:

[@thisisAB]

You realize you save lives right? Thanks a lot you need awards for this (I nominate you for the Nobel Peace Prize)

[@lorenagonzalez9421]

Thank you so much!!!! Now I really understand cellular respiration! You helped tons! God Bless you!

[@Angelina267]

this is excellent. One of the best videos on youtube. Thorough, precise, and enough detailed information to not only give us the main idea, but not too many stupid little fragments. Thank you so much. My honors bio teacher is 80 years old and doesn't have a clue what he is doing.

[@therinisley9515]

I love this! This is such an amazing explanation. I've always struggled to understand these concepts and I have ADHD so it's especially difficult for me. But I love this teacher! I plan to watch every video I can! I just can't thank you enough! It's really going to help me with my future career plans. I haven't watched any videos with other teachers yet, so I can't say how well the others do at explaining things, but if I were a teacher I would want to be this good. And if I ever make enough money to do so, I will donate to this organization.

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I am a science teacher and I am showing this to my class! big thumbs up from me

[@chrisuljanicchris8617]

You help so much. I'm studying sports medicine and this is exactly what I needed !!

[@Diannedodo]

Thank goodness for this video! My biology teacher makes cellular respiration much more compicated than it needs to be. This video will save me on the test tomorrow!

[@queenvee2227]

It took me like ten different videos but I think I'm finally understanding this!

[@marateixeira8219]

Just 10😂 I still dont get it

[@freebound01]

I live in South Africa, and if I could send you a basket of fruit or some potatoes from here to express my gratitude then I most sincerely would. Thank you for your awesome lessons.

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Thank you! I love how you use the colors . You wrote so clearly. Makes it so much better!

[@jalle88]

I know the feeling. I got exam in Physical Education tomorrow and these videos is explaining what I never understood in my courses perfectly!

[@esti3833]

me getting confused at all the college test comments because we're studying this in ninth grade

[@elena-gw3rf]

lmao same

[@angelaupton8043]

Come back in 15 years as a mature age student and see how well you remember it....

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trust me.. you wont remember this in four years

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I just learned this few days ago and now I already forgot everything

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@@angelaupton8043 oo

[@anitaclince6385]

Hi just want to congratulation you on your great work. I am retaking my Anatomy and Physiology exam in 4 weeks. Need lots of this turor work to enable me to pass second time round. I am hard of the hearing get by through wearing hearing Aids. Class was not sufficent for me.. I have lots to do in 4 weeks.....

[@johnny0jon]

I love how simplified this is... Makes me feel smart (even though Biology is my worst subject)

[@nikitamthomas]

finals start this wednesday... that means I have a lot of bio and calc videos to watch before wednesday,.. The tension video saved my life!

[@devcat3936]

God bless this man even though I still dont get it

[@luvculturegurl26]

He's amusing and teaches it correctly. Trade places with my teacher? PLEASE!?

[@dian5083]

Super nice video, clear, structured and very organized.Thanks for your input.

[@WarmWeatherGuy]

It's not 38 ATPs per mole of glucose. It is 2.29 x 10^25 ATPs per mole. We get 38 ATPs per molecule of glucose.

[@Kat-tq6tm]

I'm doomed. test over this and two chapters Monday for college

[@Kat-tq6tm]

I'm doomed. Help!!!! Pllllleeeeeaaasseee!

[@amirajaber4149]

Katie kelley good luck 👍🍀

[@Kat-tq6tm]

I got a higher grade on my most recent bio test. Now to get though the rest of the year

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me too

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doing this as a 7th grader :/

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This is the BIGGEST educational video archive i've ever seen

[@shan8613]

You, sir, have always been a life saver! Thank you so much for everything ❤️

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wow, i am half way through my Human Biology A level ( A.S) FOR THIS SEMESTER!. I was not aware of this page, it would of aided me greatly if I'd of known about it sooner! This video has been very helpful, i will continue to watch the videos that relate to my A level work. I give credit to the educator that derived this information Thumbs up to him. Thanks for posting these video's x

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Thank you so much for making these videos!!!They'll help me a lot!!!

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I want to thank you for doing what your doing here its truely refreshing to see someone take the time to help everybody else out there it shows just how usefull the internet can be keep doing what your doing because it is more than appreciated

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it helped me a lot in a scinence contest i got 1st

[@lemmewatch456]

your teacher knows Khan can teach this better than they can. Thank your teacher.

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wow..

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This is the BEST educational instruction in Bio i have EVERRR seen!!

[@Omar-zo6ro]

aaaaaaaand i'm failing

[@Monochrone15]

lol XD I feel you. This is painful.

[@arpi6054]

Sal is God sent I swear, I have a test on this in 2 days and my teacher didn’t give enough info

[@mianabdurrehmansohaib1429]

Great video.......helped a lot.....

[@asherwinter]

I don't know if this will help anyone, but the reason it is called 'Glycolosis' and not 'Glucolysis', is because althought it mainly works on glucose, other types of carbohydrates can enter the Glycolysis cycle to produce ATP, so therefore it is not necessarily only Glucose.

[@davidz8823]

Very well explained, thank you.

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I do not know what i would do without this videos!!

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i love khan academyy

[@bethy081989]

Cut about 4 hrs off studying for finals with all your Cellular Respiration, Krebs, and ETC videos. Thanks so very much. Is there a way to download your videos so I can watch them without getting online while at work?

[@ahmedalkarkhi]

Its FADH2 not FADH, nice video thank you :)

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Khan Academy is so fantastic...i haven't been exposed to such useful educational material in decades and it is getting my mind working again

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Where can I get that amazing black board with colors online? What do I google? I wanna make educational videos too and I wanna use this. Help anyone?

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thank god for this! i seriously am more confident about my test i have in 30 minutes!

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this really helpful thx a lot i needeed it

[@PivAd123]

You're helping my Biology raise from B to A. Thanks

[@awang714]

I think it should be net 30 ATP (eukaryotes ) and 32 ATP (prokaryotes) from current understanding/research.

[@DivineSeaDragon]

Alex Wang thanks

[@MsM0N3YL0V3R]

This helped clarify so much of what we've been learning in A&P. He's so clear and succinct.

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Watching this out of extreme boredom 😞

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your not the only one.... Now I'm just gonna post random questions off a Prof 2 algebra questions

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Good for you, better than wasting your time on social media or videogames.

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xeztan by I want to travel

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I have a final exam in an hour and a half. You just saved my GPA. I love you.

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HogwartsIsMyRealHome how did you do?

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I was supposed to be on holiday,but I'm here instead thanks to my parents. Sigh

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Dude I have to take IB bio right now, and I hate it with all my heart, but watching khan academy makes it all fun, and easier to learn

[@teto5447]

what happened to the oxidation of pyruvate after Glycolysis?????!!!!

[@nubiagoldd]

+tet o I believe those are the two carbon backbones he was referring to at the top under glycolysis

[@ethanyandow]

I've understood everything this semester except respiration and this has been a really good review to help clarify before exams. Subscribe!

[@yasna2001]

i have my SAT biology subject test tomorrow and i'm fucked to say the least

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Yasna Ali good luck

[@yasna2001]

Nicole Hartson hah thanks it wasn't too bad but i'm definitely not getting a good score

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Yasna Ali of

[@achams123]

Hey Sal, just to clarify something for you. 38 ATP's are generated by aerobic prokaroyotes and 36 ATP's are generated from aerobic eukaryotes. The reason for this is because in eukaryotes the 2 NADH's that are generated during glycolysis in the cytoplasm need to traverse the mitochondria membrane in order to take place in ETC. The NADH's traverse the mitochondrial membrane using a porin channel that needs one ATP per NADH. Since proks dont have membrane organelles they save these 2 ATP's.

[@oshitomaha]

Glycolysis needs 2 ATP's, to generate 4 ATP's so on a net bases generates 2 ATP's??? wtf is that

[@joelmooner69]

ATP is energy.

[@jenniferfelix7981]

Think of ATP as money. To start your business (glycolysis) you spent 2 dollars (2 ATPs) and at the end of the day made 4 dollars(4 ATPs) therefore you profited 2 dollars (a net of 2 ATPs)

[@piousalpha3733]

Jennifer Felix that was a good one

[@jenniferfelix7981]

Pious alpha Thanks I'm glad it helped

[@dellamassaley976]

Jennifer Felix thanks a lot for this comment,helped me alot.

[@Lisannewicekd]

And I FI-NAL-LY get it! Since I have this years' worst biology teacher who just sits back in his chair letting us figure out what's it's all about, I really really needed this for my test tomorrow!

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sameeee!!!!!!

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Here for midterms :) rip

[@HarryPStuff]

Thank you, THANK YOU for subtitles. I hate it when I have to guess what people are saying, which would be especially difficult for this video.

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why do you give these videos for free?? they're so good..u'd be so rich if you cost money for tuitions..the whole world's gonna come and pay you....hi..m shreya from india..can u add some more videos related to medicine studies..I mean higher studies..ryt now m in 10 th year but I would need them for my 11th and 12 grades also..plz!!!!!! awaiting response..thnQ..plz!

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May be u are rich enough to pay for each and every online helpful or useful videos. But many people arent. The more the number of viewers the uploader gets the money, so its fair.. If the video is nice and watchable then it is obvious it will have maximum viewers and the uploader get to earn money and the students who are hungry for knowledge gets to lear many new and interesting things.

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you can find these videos in khan academy, just search it online cuz its there. its like lessons just like this video and it can vary to a lot of topics too.

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I just wanted to let you know how much I appreciate this video and your work as a whole. It's extremely helpful and your explanations are easy to follow. thank you very much

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How old are you guys? I would like to see the age variation of the people who watch these videos.

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Esteban I'm 11

[@yumekoshousepet]

I am 14 and I am going to fail my test... badly.

[@yumekoshousepet]

14

[@saffrown]

Esteban 15 but in grade 11th and most likely flunking my test too lmao

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AL No worries about a thing

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after watching this and the photosynthesis video, i took my test and got 100 on it. my life is complete thanks to you :D. I greatly appreciate your videos VERY much (not that i didnt understand anything but this helped me reinforce everything.)

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I thought you did math!?

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Drakkona Durab Seriously, he does everything!

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Donate people! Even if just $5. This is SO valuable! Especially for those who don't have access to quality education like this. Thank you, Khan Academy, I appreciate your work!

[@叶靖宇-j8i]

Doesn't it produce 36 ATP?

[@KB_MUFC]

No 38

[@rileyb5987]

38 ATP is how many ATP that is produced in the entire process from 1 glucose, but there are multiple steps that require ATP and only produce ATP under ideal conditions so the NET ATP is closer to 30 ATP. It is calculated as cytosol NADH (NADHc)=1.5 ATP (as it costs an ATP to enter the mitochondria) mitochondria NADH (NADHm)=2.5 ATP GTP=1 ATP FADH2=1.5ATP Glucose = 2ATP+2GTP+2NADHc+8NADHm+2FADH2 = 30 ATP (text books say 36 because they round all the .5 ATPs up and 38 because they dont account for the invested 2ATP.)

[@gertrudechikwanka4370]

+叶靖宇 one molecule of glucose will produce 38 mol of ATP if the NADH produced is transported to the mitochondria via the malate shuttle but if it is transported to the mitochondria via the glycerophosphate shuttle, only 2 mol of ATP will be formed so the net production will be 36 instead of 38

[@qwertyokful]

+叶靖宇 Without the Krebs cycle it would produce only 36 but combing the process of the Electron transport chain and the Krebs cycle it creates a total a 38.

[@sophieagudelo7477]

On school tests (EOCs) it says it gives 36 instead of 38 so teachers say it's 36 instead of 38

[@syberk1d]

hi, please dont give up, its hard to get your head around it at 1st. But with hard work you'll understand it bit by bit. I still only understand some of the concepts and ive been doing bio for one year now. We all are stil learning, some pick it up quicker than others, im one of those types that are not fast at understanding concepts. I have to put a hell of alot of time and effort into it. My point is keep at it, start from the very basics like the mitochondrea (atp power house) let me know if

[@AliveInChrist324]

he gets kind of off topic and is super repetitive

[@Celinestu333]

he is just trying to be very clear cos not everyone is like you, intelligent -_-

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i dont think so.....his explanation is very good tho....

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Genius! Wherever I go in my studies, THE SAL has been there before, and is ready to expalin astounding!

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I'm a highly qualified Engineer and recently getting bored of Engineering. I started loving Biology because of Khan Academy . I wanna be a great biologist

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THANK YOU, I've got a test tomorrow on this and I'm confident I will not fail. :)

[@RUSSKAYAG]

Every single cell in a human body has a mind portion meaning it can be controlled-by thought. Cayce said that any physical disorder is a consequence of sin. You can repair it by a positive thought and self forgiveness. Any life situation, whether in business or personal relationship keeps on repeating until a lesson is learnt. Accept that situation, walk away with love, not anger- that life program will be de-coded.

[@moocowman0]

Mr. Khan, you are absolutely incredible, however I really think you should do a video on anaerobic respiration and go into more detail about fermentation. I know it's not all that complex or important, but because it was not in your videos, I was very confused when I tried to read my biology book. Thanks though:) sooo much!

[@countygirl35]

Thank you for this video! I'm taking microbiology and this video actually made sense to me as oppose to my professor who makes no sense at all when she teaches it!

[@MrOllieb27]

presentation in two hours he most defiantly saved me.

[@runenoobnak]

Actaully, it is anywhere from 36-38 ATP. NADH+H+ each provide 3 ATP, while FADH2 provides only 2. 8NADH+H+ are produced, giving 24 ATP, and another 2 FADH2 bring the total to 28 ATP. Then 4 ATP come from Substrate-Level Phosphorylation, bringing it to 32 ATP total. Finally, two more NADH+H+ transfer their electrons to either NAD+ or FAD+. Depending on which receives the electrons, the number of total ATP goes from 36-38.

[@MrVargasesteban]

im in 12th grade in this moment and biology was really hard for me in 9th grade, i wish i knew about khan academy back then...

[@mooony94]

i have Biology exam on sunday ! and i lost my text book , i thought its the end for me but thank god i found this , really helpfull ! thankyou , a question , what about link reaction stage , u didn't mention it at all ? it comes after glycolysis .

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seriously, you are my savior.

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do you know something KHANS ARE ALWAYS THE BEST.........

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Thank you so much! It is because of your videos that my entire college tuition has not been wasted! :)