How the heart actually pumps blood - Edmond Hui

View full lesson: ed.ted.com/lessons/how-the-hea...
For most of history, scientists weren't quite sure why our hearts were beating or even what purpose they served. Eventually, we realized that these thumping organs serve the vital task of pumping clean blood throughout the body. But how? Edmond Hui investigates how it all works by taking a closer look at the heart's highly efficient ventricle system.
Lesson by Edmond Hui, animation by Anton Bogaty.

[@scottseptember1992]

I think another important distinction to mention to students is that the "blue" colored blood (representing deoxygenated blood) in diagrams of the cardiovascular system isn't actually "blue" colored in reality. Some kids think that our deoxygenated blood is blue, but in reality it's just a darker red than oxygenated blood. Then you might ask why can I see bluish and greenish colored veins on my wrist. That's actually due to the way light interacts with your skin that makes it appear the blood inside those vessels are blue or green, but they're still (dark) red.

[@quinvlogs1288]

thanks

[@fujo44]

Thank youu

[@PulseBox]

Thanks for the fact

[@poushanichowdhury378]

I think you have learned from aumsum time. It was already known to me.

[@waffles_1823]

Thks

[@RaveQuicksilverStudios]

I swear that is the cutest heart I'd ever seen. Nice job.

[@DevilSpider_]

bogaty's art style is pretty good

[@liniem4963]

please dont swear

[@mabzland1593]

True❤️❤️❤️❤️

[@mabzland1593]

[@fatimacabudoy3592]

Fh

[@terranceblakely1398]

I feel as if the explanation was just about to start when it ended :(

[@davidndiulor8428]

What more do you want, the heart pumps blood around the body

[@edmondhui2863]

+terrance b Yes. The point is to invite you to do the actual demonstration rather than rely on video. Nothing can prepare you for seeing the real thing and knowing it's the same as what's happening in your chest. Ed Hui

[@fluffypuppy0]

sameee.

[@Eric-rm4uu]

To make things worse, in an effort to simplify things, they simplified the explanation too much to where you don't get an acurate explanation, the narrator says "blood goes from one heart pump to the lungs, back to the second heart pump which sends it to the body" this kind of sounds as if he's saying that all the heart does is pump blood from one pump to another to be sent to the body, totally wrong, and confusing, I think I can make it a little more clear, please follow me if you wish: Deoxygenated blood, vena cava, left atrium, tricuspid valve, left ventricle, pulmonary semilunar valve, pulmonary artery Deoxygenated blood from the system will flow into the right atrium from the superior vena cava, then it'll pass through the right atrioventricular valve or tricuspid valve and into the right ventricle, the heart will contract and this blood will consecuently be pumped into the lungs through the pulmonary semilunar valve and the pulmonary artery to be properly oxygenated Oxygenated blood, pulmonary veins, right atrium, mitral valve, right ventricle, aortic valve, aorta Once oxygenated, the pulmonary veins will carry blood from the lungs and into the left atrium, the left atrium will pump this blood into the left ventricle through the left atrioventricular valve or mitral valve, once there the heart will contract and the left ventricle will pump the blood through the aortic valve and into the aorta and to the rest of the body This is a little more drawn out, and it's still very simplified but I think it's a little more clear than how the video describes it, I hope this helps.

[@edmondhui2863]

Actually, I hope it helps you but it doesn't help anyone who's never seen it work before. Your second para is a list of nouns, as is your fourth.Your third and fifth paras are like tour guides. This is not informative for people who don't even understand what a pump is. The video addresses the fact that students usually don't even understand the most basic observation, which is that the heart is really two pumps- one to pump blood to the lungs, and the other to the body. The fact that oxygenation and deoxygenation occurs is also important. The names of the parts the blood passes through are actually just 'facts' to be regurgitated in an exam, at this level. They are non-explanatory. So many students have never seen a pump of any sort work nor know what a valve is, so calling something a mitral valve is non-explanatory. In any case, the video has one overriding point- it is about the discovery that we made that you can actually demonstrate this wonderful thing working in a school lab. Not a model, not an animation, but the real thing- and students can use their own hands to make it work. If you do this, you will understand and internalise the heart's function directly by experience- this is something that nobody knew could be done in hundreds of years of study of medicine and anatomy. Please try it.

[@ianciborowski2983]

Change the title to "how hard the heart is to understand" so it's not so confusing because I thought the video was going to explain how it works more

[@ajfariscal8687]

Because you dont understand xD

[@thuyngoxuan1497]

Fjjldsfnjljedhfljernfklejflfjfkjerfklrehfilerhfliwhriofheroufhouerofjirjwfwiljfiorwjfliwjrfiorwhgiioojgilfejgjerjiojgpogooonjmklgfejlkejflgkjlggoodjfdkbjjldfjkljlk find the word good

[@jagatdave2521]

Ian Ciborowski I didn't understand what u said now more than the video

[@PolaOpposite]

The title should be changed to "How to bitch & whine about how not to teach about the heart, then make the same mistakes in teaching about the heart." Yeah, it's a long title, but it covers all the basics.

[@yahma1235]

Ian Ciborowski I agree with you

[@DJchilcott]

Is it wrong that I'm picturing doctors having water-gun fights with hearts now?

[@timetogetcancer7866]

Yes

[@davidndiulor8428]

They also use brains as stress balls

[@bjgeantil]

no

[@BleachedBlackSocks]

no, I actually want to get a fresh heart now... just to get an all natural water gun!

[@stupiidbee]

Noesn't

[@starsintrash9218]

Tbh the title is a little misleading. (because how the heart actually pumps blood is a whole theory with the impulses and all that) But i get their point on how they tells us to appreciate our hearts more and take time to love it and understand it. The heart can beat without you but you cant beat without the heart. ♥️

[@IronDragon1337]

I'm 14, and I've watched an open-heart surgery online. The heart looks amazing in action.

[@teddytaffy4574]

Yeah count me out

[@IronDragon1337]

@@teddytaffy4574 Now 18 and going to college for cutting up dead people 😎

[@BRNOOB_]

@@teddytaffy4574 +1 xD

[@thisismyreply6299]

​@@IronDragon1337 20 now?

[@pinoypooltv]

You're 20 now

[@ollaextra2602]

The heart is indeed a fascinating organ to the man. Throughout the history people always wanted to know what it does and how it works. It wasn't very long when people used to believe that the source of our memory is heart, that is where the phrase "Learn by heart" comes from.

[@halamadrid7156]

Memory in the hippocampus

[@momogoes3329]

I feel like this video is misleading. I honestly felt like I got a pretty good understanding of how the heart works in my college biology class (not a med student). We didn't just label the parts but learned every step in how the heart pumps, where the blood flows, what electrical signals are being used, and when the blood is oxygenated vs not. Found it very fascinating.

[@kingcobra-sq5zy]

whats misleading in this video?

[@manishholla]

@@kingcobra-sq5zy the literally "running heart" Might be!!

[@mereadswiki6175]

the heart is so cute!!! :D

[@gatinatoranimatorcorp]

and shmexy

[@KhushiKumari-nw3ox]

🤣🤣

[@whotao3047]

*pink panther theme plays

[@halimaelwerflee1303]

Ikr

[@kothaiiyengar.8583]

???

[@darksoals]

You guys really put your heart into this video.

[@spiros1994]

You are amazing at explaining things and displaying kinda "creepy" things that even a childernen can see and understand!

[@kaizahjones99]

This video is soooo awesome and informative!!! Im so glad you guys made it!!! My one year old son was born with heart a disease called Ebstines anomaly. One of the characteristics of the disease is his left ventricular valves dont completly touch! His heart used to leak massive amounts of un oxygenated blood into the rest of his body he was in the hospital for months at birth and blue...However the human body is an amazing thing! in order to create balance his heart formed an extra tiny tube from his right atria to his arota to sneak some oxygen in and make up the difference!!! He didn't even need surgery! now when any one ask what happened to him I can show them this and explain!

[@kaizahjones99]

Sorry non-oxygenated

[@teddnet]

Kaizah Jones What a wonderful story! Do go to the TED-Ed site and the 'Dig Deeper' section where you can see links to other resources- the original scientific paper, a TEDx Talk, and in those, video of the actual demonstration. Regards, Ed

[@kaizahjones99]

Thanks! Ill check it out

[@dolfyrantsparodies608]

@@kaizahjones99 How is he now? Hopefully he is doing great!

[@sridharhs1460]

The animated heart in this is so cute😊😊

[@owen9943]

I'm a nurse. I wouldn't exactly call this video the best educational video.

[@nirmalmaharjan737]

Remove the tag of nurse

[@ask4592]

Ow En well what are you doing here then?

[@pawanrastogi7473]

Lol

[@daniel_pinilla]

amun sikandar to learn?

[@colinfairburn1760]

@@klab3929 You don't know what a nurse is do you?

[@BeTheChange16]

You just have a way of explaining things,I love it

[@karinashaikh3978]

A great informative video.... Easily understood the function of heart and simple language used... And great animation

[@northhallbabe13]

this was great!!! explained very well and in the simplest way. thank you!!

[@edmondhui2863]

+kristin martin You're welcome. But try and do the actual demonstration yourself. Ed Hui

[@lo1_idk]

Yepp!!!

[@envysoph]

Hi I'm a 12 year old girl but not very smart anyway, i want to be a doctor so i can save many life's, But i'm not sure where to start so i thought i should understand how the heart works And how it pumps blood, anyway i have no idea how to get my grades up. So does anyone have a idea And you might be thinking that i'm too young to think about what i want to be but i really want to be a doctor one day! :) Oh by the way i haven't thought of which type of doctor to be. I think there is different types of doctors....? ( Sorry for my grammar and if you can tell me what mistake are in there as well! And No hate please! )

[@ajfariscal8687]

RudolfShinyAJ I think youre smart.I think youre teachers give u low grades because they are grumpy.Alway be great in class.I prefer veterenarian so that you can help animals.

[@envysoph]

Aj1994 GT Thanks :)

[@envysoph]

Eric P. Tran Excuse me i have brown hair. I'm not black or blonde, i know i'm not smart and is not my fault. I been trying so hard. So give me a break!!!! Oh and people who have black or blonde hair are smart. So don't think that blonde hair people or black hair people are not smart!. Anyone who have different hair colors or skin are smart in anyway! But for me i'm not smart at all but i try. so that what matters to me the most.That i try so hard that i'm starting to improve more by little bit each day.

[@caitlyngarb7150]

LilacSongz there are SOOOO many different types of doctors. The heart is a nice place to start if you're trying to learn to be a doctor. Keep searching around in these videos. Watch some videos on the immune system, I found those quite interesting. How to get your grades up? Well, this might not work for you but it worked for me. Take the topic you hate or struggle the most in. Think about this topic in a really harsh way. Find its flaws. Now whenever you learn about this topic, think about its flaws and work around them or try and patch them. It might seem like complete nonsense, but i told you it worked for me.

[@envysoph]

Rcm E Thanks!

[@MattsMotorz]

Misleading title.

[@ajfariscal8687]

No its not

[@MattsMotorz]

Aj1994 GT I thought it was. It was more like "The heart is not as confusing as you think" It was also weird. I never thought the heart was particularly confusing, but he was talking as if it was this super complicated subject that few people understand. At some points it was even a bit condescending. Weird.

[@edmondhui2863]

I'm not trying to show it's super confusing. I'm pointing out that nobody ever figured out that you can ACTUALLY make it pump outside the body. That's why the 'actually' is in the title. It's really easy to understand what the heart does once you know about circulation, but Leonardo didn't. So he really was 'super confused'. Nowadays, people aren't confused, but they still don't actually see it working. I mean, you can see your arm working, and you can feel your biceps contracting and your forearm moving. But until I discovered this demonstration (removing the atria), educators and students had no opportunity to actually see the heart working. That's why there are so many animations on KZbin, and why so many science lessons get students to make models of the heart. It's actually a new discovery that we are announcing here- a new way of demonstrating heart function in schools. Regards Ed Hui

[@MattsMotorz]

Edmond Hui That's pretty cool actually. But looking through the comments I can see that I am not the only one with this opinion. The title is not good. The fact that you need to explain to me what you did shows that the title, and video, did NOT deliver that message at all, which means the video delivery is not good either. Don't get me wrong, it was a good video, as all these ted-ed videos are, but the message isn't clear. At no time did I think this was a new discovery and I didn't grasp that it was important. I had no idea that no one figured out you can't make it pump outside the body (which to me, is remarkable after all these years!). None of this was mentioned at all, so to me it just seemed like an overly long way of saying "look how simple the heart is!" That is why it was weird when you started going through the whole procedure.

[@edmondhui2863]

You're right. It was exceptionally difficult to come up with a title and a script, and within TED-Ed's guidelines (how it fit with the other TED-Ed lessons) and the time limits. You'll also be amused to know that when I show this to doctors and surgeons, they are either in agreement that it's cool and wonderful that the thousands of anatomists and students who have looked at the heart also failed to discover that it would work when manually pumped; or they fail to see the significance at all- 'yes, but we already know how it works!' I was lucky that the peer reviewer at the journal where it was published was an experienced teacher, and her comment was that she couldn't understand how she could have taught the heart for decades and failed to find this technique herself! Personally my slant on this is that it proves that genuine scientific discovery (be it ever so marginally useful) is available to everyone. I will forever be amused that I found something that Leonardo could have but failed to find. He would have been greatly amused to see it pumping. I'm told by the keeper of the Queen's pictures that he is certain that if Leonardo knew of this technique, he would have recorded it.

[@user-oi5ty6mk2k]

Simple: Contraction of the muscle tissues of the heart. This contraction leads to the flow of blood around the body through the blood vessels.

[@playeralif2552]

I feel some weird feeling, my heart rate is getting shaky when he show the picture of a beating heart. XD

[@rachj1398]

The narrator has the best voice for these type of videos. 🥰

[@annvytherph]

I do believe that not only MD's and med students understand the moa of the heart, do not forget other courses and health care professionals.

[@hannahsalleh]

Ive got an exam in 6 hrs on this and this was exactly posted today ohmahgod thank god

[@OenMio]

This did not actually explain how the heart works, but only cleared some misunderstandings of the public.

[@fleek6319]

I actually loved this video!! Especially the cute animation of the heart :D

[@carlosmattessich3883]

I’ve literally had a test on this topic last Thursday and now KZbin recommends me this video

[@dontmakelemonade]

I love these animations.

[@kkfung1]

Too much time is spent on unimportant chitchat. When it comes to the figure 8 animation, the really important point, the speed is unnecessarily too fast to easily follow without watching it over several times.

[@teddnet]

There is a context to everything. This is not standard practice turned into animation. It's a NEW technique. How often do you come across something that Leonardo studied, could have found, but missed? The figure 8 animation is not the important point. It's an illustration of the misconceptions that can occur when you learn about the heart from an anatomical label perspective, rather than a functional point of view. This technique is designed to introduce the heart from a directly practical, functional point of view. The important point is the invitation to get a real heart and look for yourself, to get a direct, tactile and visual understanding of it as a pump.

[@kkfung1]

teddnet Very often, what is intended may not be what interests the viewers. Any way. who did the animation? Edmund Hui or Tednet? What is Edmund Hui's role in this lecture? Narration or idea?

[@dBvibe]

KK Fung Edmond Hui most likely wrote the lesson (idea). Addison Anderson did the narration. Anton Bogaty did the animation. 4:13

[@teddnet]

HY DX Correct. I discovered the technique while mentoring Archie Taplin for his TEDx talk and wrote the scientific paper describing it. See the TED-Ed lesson Dig Deeper section. I wrote the script and had the opportunity to advise Anton Bogaty as he developed the animation. The animation serves a dual purpose of announcing the technique in context to a wide audience of educators around the world, as well as giving sufficient detail so that anyone can see it for themselves. It is not designed to be a substitute for the demonstration. It IS supposed to be fun. :)

[@brandonirvine7821]

KK Fung haha lol I’m in year 8 an I understood it better than u on the first time

[@anvee5337]

This helped me so much I learned new things from this video 🖤

[@alcaldealer8515]

Best Ted Ed audio man. Thank you!

[@googleg5]

Hmm I wouldn't say this video is the best demonstration of how the heart works and pumps blood. you should just skip the history and dive into the physiology of the heart. I got a bit confused of why you think removing the atriums out of the picture would be easier for new medics to understand the concept of how the heart pumps blood.

[@Chadlite]

If you had a demonstration of this with an actual heart, it would be less confusing than an animated one with eyes, legs and arms. I don't get it why that was even considered in the animation process.

[@orangemonks894]

Your a wyrm

[@YourIQDoesntMeanShitToMe]

Oh but "it's so cuute!"

[@ramdanabdha8352]

It makes us grateful in everyday of our life

[@Audio21-MUSICislife]

The last line about the heart Racing when I catch the eye of the person u love ❤️made me realize I still haven't felt my heart😂

[@oomh2020]

In the mid 1200s Ibn al-Nafis was the first to have a description of pulmonary circulation

[@nancyjavkhlan613]

Thank you soooooo much! This actually helped me soooooo much. I missed science one day and of course it was the most important day so idk anything. Now with this i might not fail.

[@Urb4n0Ninj4]

I don't think they ever typed "Cardiac cycle" into youtube when they made the statement "crude animations". There's a lot of good ones out there.

[@teddnet]

Yes I did. And this video is also crude. But the message is that students can actually see the real thing for themselves. Ed

[@MorrisonEnterprise]

Instructions unclear. Got spleen stuck in ceiling fan.

[@RustineBueno]

The parts are the Aorta,Atria and the Ventricle.😇😇😇

[@2012farfar]

While I was seeing videos about the heart function and pumping, I wondered how did they really know what's happening inside! Thank you!

[@ashtonkock7683]

the illustrations help a lot,, as well as this dudes voice 😭🤩🥳

[@videoloops1]

The creators didn't put their heart in making this video

[@Endokuu]

what makes you think that :?

[@nagaprabhashetty8011]

​@@Endokuu they put the pig's heart but they did put their heart too

[@Blood4Africa]

Very informative ..

[@guadalupevergara5571]

it is interesting to know how the mechanism works and the number of beats the heart gives its lifetime, I did not expect 2 billion.

[@nettart4924]

I love this adorable animation!

[@wholeNwon]

Actually, the pumping function of the heart has been understood for a very long time. The connection between the arterial and venous systems through the capillary bed is the more recent discovery (Harvey - early 1600s). The video was only minimally informative.

[@GeolyteGM]

I feel my heart bumping! 😃

[@taylorxwx2367]

Me too!

[@Crispy_pata]

Alejandro Mendez same

[@jeanmahmoudventilateur3480]

Thanks youtube to have recommended this to me. (I've got a blood phobia, draws like that helps me a lot)

[@thawzin7924]

It's the cutest thing I've ever seen on educative YT video.

[@nataliekwiat4776]

Well made- but I would've loved to actually see a little about how it actually works. (P.S., it's really not as complicated as this video might make it, but 1000% props to this vid for psyching people out of learning the circulation. ^-^ -fellow med student

[@teddnet]

Hi Natalie. Please understand that the point of the video is to invite you to do the demonstration yourself. If you are a medical student, I'll bet that this demonstration was not shown to you during your studies, because as far as I know, it was not known that it was actually possible. If you follow the simple instruction of removing the atria, you can work the ventricles and see the valves opening and closing directly, and not through some animation online. The video itself is not meant to show how the heart works- the animation is meant to be simplistic. But when you actually see it live, it's amazing. Hope you give it a go. Regards Ed Hui

[@011azr]

I don't understand. What's the difference from what is being taught in school? What's the misconception? I don't see anything else from what I've already know since elementary school.

[@Paskalip]

Had exactly the same reaction... All the given facts in the begging, about how everybody have no idea how a heart works, are completely misleading. MRI anybody? truly disappointed :/

[@teddnet]

***** Sorry you're disappointed but that's not the aim of the animation. It's an invitation for you to try the demonstration for yourself. If you want to see the full explanation of this new method of teaching the heart, please see the 'Dig Deeper' section of the TED-Ed page for this animation. Ed

[@pokemonmewtwoofficial6692]

ive got homework on how the heart works i thinkit helps!!

[@SweetBunny706]

Thank you for the lesson!

[@fahrin3357]

Lol we watched this health class. It was really helpful thank you!

[@Jordan_Dossou]

wow. my heart is amazing. I've been taking it for granted 😥😷❤

[@joannajoel]

*0.55 💖 The Heart Dance* 🤣😂🤣

[@LifeyApp]

love these videos!

[@kendraasonye678]

Thanks tednet! This is very helpful!

[@ConectoP]

4:04 also you will get existential crisis by thinking about how my entire life is up to this little blood pumping organ.

[@yojgee]

I'm a heart and I find this offensive.

[@rachieslotus7214]

Judging by your username, you’re obviously a bird.

[@kevinp9659]

Judging by your profile picture, you're obviously a road.

[@whotao3047]

Judging by the amount of subs you have, you're obviously 42 years old.

[@SubscribersWithaFewVideos]

Judging by the amount of years u wrote this comment, you probably graduated

[@upkarsingh464]

@@SubscribersWithaFewVideos mnje

[@boonewalker3973]

Super great introduction for me . Thanks

[@WennieBoy01]

Great and simplified.

[@user-kl6vh9mc6f]

When i was a Baby i had a hole in my heart so i use to have inhaler nearly every day so i really want to know how Does that happens 🤔🤔🤔🤔🤔🤔

[@thisissyedbasim]

0:53 Heart function tho

[@HandsomeBoyGarion]

This makes my heart happy thanks for this good video. Man

[@dhylansyson3861]

Love the animation and good use of facts!

[@100ksp2]

I'm meant to write ten facts I learnt from this video...

[@RajendraMeenangr001]

can anyone tell me what is the source behind pumping of heart?

[@nightwolf3329]

muscle contractions in the heart, make the chambers "grow smaller", creating pressure that pushes blood to the ventricles/ out through the arteries.

[@BiologyByteYoutube]

A patch of muscle called SAnode initiates the process of contraction of the heart chambers.

[@zainabb.2792]

Amazing! Thank you.

[@lyonidus3073]

Thanks, helped me with an assignment!

[@almondtart]

i feel like i'm gonna fail my bio test now

[@proxxei9906]

Thing is, your heart stops just for a moment, ur ded

[@tanish8644]

a heart can be restarted in certain situations though

[@meandmybarbie]

@@tanish8644 yeah, that happened to me

[@buryakulikov2415]

Your heart stops approximately 2/3 of the time during diastole.

[@HarshYadav-uu8hx]

nice way to present the things

[@Deocharlesc]

THIS SHOWS HOW SMART THE CREATOR IS. Even before math were discovered and computer exists, the Creator has done this IN THE BEGINNING OUT OF NOTHING.

[@nesquix926]

of course

[@enigma63071]

humans had no idea what the purpose of heart? and Da vinci was confused??? have you ever heard of Galen of Pergamon or Al-Nafis? the first lived during roman empire and the 2nd was in 13th century and both of them described the purpose of the heart and what it does with a very close description to what we know now...

[@Uthfasbethud]

you're quite right; hard to believe no one looked this up a bit before writing the video.

[@teddnet]

Al- Nafis possibly. Galen definitely not. Da Vinci definitely confused. If you read what Da Vinci wrote around his wonderful heart drawings, he thought there was nowhere for the blood to go, so he was convinced there were holes in the septum between the ventricles, and / or back flow through the valves. If he had actually tried this technique he would never have thought that. Martin Clayton, keeper of the drawings in the Royal Collection, confirms that Da Vinci actually gave up anatomy after failing to figure out how it worked.

[@meme_lover.69]

When I drink Caffeinated drinks, my heart never races XD. I'm 100% calm fam

[@kearneyl8047]

I love this!! Thank you soooo much for this video!!!! Nice!!

[@Jana_op]

Thank you so much 🙏🏻 😢

[@badr_marfou]

Why don't you mentioned that Pulmonary circulation was first described by the Muslim physician Ibn al-Nafis in his Commentary on Anatomy in Avicenna's Canon in 1242

[@teddnet]

Because there was no time. It's mentioned by several commenters below as well.

[@zone07]

@ 3:57 Who else still placed their hand on their heart even though we've done it in the past?

[@teddnet]

When you see the demonstration done live, especially with a pig heart which is pretty much exactly the same as your own- the effect is very moving.

[@searcher66]

@TED-Ed neither the explanation nor the animation worth the time, Please update this

[@misspineappleangel]

Nice introduction to the heart a different way to look at it😀

[@fever1]

ya know it's cool until you realize someone did this with a real, not-cartoony heart that changes a lot

[@RustineBueno]

I even know the life cycle of the heart.😇😇😇

[@MsLindsayBoo]

The basic principles of cardiovascular care seems simple enough, but can be difficult in practice, particularly if there are a number of complicating conditions or factors.

[@radrichgaming4623]

If your wondering where the blood comes from is not the heart. Its the bone marrow. But why does the heart pump around blood? The heart pumps blood around the body, it contracts multiple times(faster if your use energy quickly, slowly if your sitting/sleeping) so it contracts when a load of fluid it gains pressure, then it gets blood into your organs for us to not die.

[@randomclips4094]

Im not the only one who touched my chest and feel my heart beat, right??RIGHT??

[@Hartsikasvo]

So.. i'm a bit confused. People don't generally know how the heart works? This was like basic stuff in the biology classes i took...

[@JamesTTierce]

Explain how it works then? It's a fairly complex type of pump

[@gemmarwen9364]

I can see that in USA you didn't have the mythical 90's series "Once upon a time the life". In Europe was a total success including nowadays, so at present many parents show the series to their children because we learnt so much with these lovely cartoons.

[@marianhartley3809]

well esplained. Good animation.

[@zikiardani7277]

I watched this after watching "Organ story"

[@maxnguyen3503]

Lets take a minute or two. Relax! Close your eyes and listen to the heartbeat. Think about the lessons you were just taught and admire the wonderfulness of the heart. Thanks it for keeping you alive. If you ever feel stressed, think about the organs in your body. They work so hard to miraculously keep you alive. Don't waste their effort days after days. Don't be ridiculous of thinking about killing yourself. Think about the wonderful things inside your body that God gave you. Don't suicide.

[@senymaharjan9807]

So nice explanation

[@Undercookedsteak]

I’m trying to decide if I wanna be a cardiologist or a pulmonologist both sound really Intriguing and interesting

[@randomslavicguy2166]

"Hui" - that's a very interesting surname when you know polish language...

[@goldilockszone4389]

what did i learn after watching the video - NOTHING !!!

[@totallynotaj5523]

Yeah I didn't learn anything either

[@132o4_]

Cuz you guys already know all this. But someone doesn’t. Not me.LOLZ

[@shilpareddy2267]

LOL...

[@madisonsscar]

i loved the video, i learned a lot

[@belramirez5660]

Something really interesting about the video is that even in the 21st century only a few peole have actually seen how the heart works and most of the diagrams or models on the internet don´t really show how it works!

[@teddnet]

Hello- this is Ed Hui- the author of the scientific paper on which the animation is based. The purpose of the demonstration is to allow students to ACTUALLY WATCH the heart valves at work. As far as we know, that has never been done before in school, where the default activity is to cut open and label. Also, Galen and Da Vinci didn't get it. Galen especially caused centuries of misunderstanding, which meant Da Vinci was so confused he couldn't believe it was a pump even though he could see the parts acted as a pump. According to Martin Clayton, curator of the Da Vinci drawings in the Royal Collection, he was so confused by this- that the heart looked like a pump but there was apparently nowhere for the blood to go- that he gave up anatomy altogether. Even Harvey, who certainly did understand it was a pump, had some idea that it only worked when inside the animal. He literally cut open the chests of living dogs, to show blood spurting out of the aorta when he cut it. If only he found this technique, many dogs would have been saved from horrible deaths. Apologies to those of you who don't like the simplicity or length of the video- that's a TED limitation. But if you go to the TED-Ed site, you'll see a range of resources in the 'Dig Deeper' section that will show you the details of the demonstration. Regards, Ed