Lub Dub | Circulatory system physiology | NCLEX-RN | Khan Academy

Ever wonder why the heart sounds the way that it does? Opening and closing of heart valves makes the heart rhythm come alive with its lub dub beats... Rishi is a pediatric infectious disease physician and works at Khan Academy. Created by Rishi Desai.
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[@shuvrajyotichowdhury723]

Dude posted this 10 years ago and saving lives for another few decades

[@LAZG-vo2zo]

So true

[@Epic117450]

It's amusing how much better you are at teaching this than my bio teacher...

[@mischb.1943]

I was essentially think the exact same thing. Lol

[@nourai5653]

Same

[@anneliese2966]

same here

[@jadeblu9294]

Epic117450 dude, that why we're here. 😂

[@shayona1460]

I think ure graduated now =)

[@eazyprofitgt5364]

Blood flow Acronyms I made up to remember them.... Valves: "To Perform My All" ======== Tricuspid, Pulmonary, Mitral, Aortic T(o) P(erform) M(y) A(ll) ====== Chamber flow: "Real Americans drive RV's from Los Angeles to Las Vegas" RA->RV > [Lungs]> LA->LV-> [Aorta] R(eal) A(mericans) [drive] RV's [from] L(os) A(ngeles) [to] L(as) V(egas) ======== Hope that helps anyone.

[@tak2malay24]

sure it did. thanks

[@MudderFukker-m6g]

So... *YOU* made those up, Huh? Interesting that we *BOTH* made up the same weird phrases... That's amazing.... I mean, what are the odds..? Must be a *MAJOR* coincidence... almost as likely that I would post it here, and then you would post not only the exact same mnemonics, but the *EXACT SAME POST* ...

[@fluffysugarball]

Ɩт яɛαℓℓʏ нɛℓρɛ∂ мɛ. Ƭнαиκƨ 😊

[@riyajha788]

There is no chance my biology teacher would have taught us like this....u r truly amazing sir🙏🏻

[@kennethlincoln7598]

I am taking my pre req'd A&P class for my upcoming Paramedic Program. Khan Academy has not only been a staple for my understanding of material for the class, but also for my life. THANK YOU KHAN ACADEMY!!!!

[@Clasq_great]

Just good to understand a normal function of the heart. Better than any teacher at schools.

[@lowlalve43]

.... i feel so smart after watching these vids

[@danielcontreras3956]

Love the video! Thankfully the voice wasn't monotonous and he gave a clear explanation.

[@Powerfulmantha]

I just want to say thank you so much for all of your wonderful videos!! I am currently a nursing student in my last quarter of school and have utilized many of your videos throughout my program! They have helped me immensely! You guys are amazing and I have and will continue to recommend your videos to many of the first and second year students that are in our program!!

[@syberspy9]

Mad mouse skills, I was impressed by your cleat writing on paint with a mouse lol

[@r3dsh1ft3d]

He has a stylus.......

[@whysomad6338]

Russell Barnes Sssshhhh! Don't ruin the magic!

[@jksbottommole8463]

what stylus?

[@freakinfolks457]

syberspy9

[@vardaan5947]

@@jksbottommole8463 it's a kind of pen, used to write on computers or other screens which supports it.

[@paulson2008]

Those dislikes are from teachers 👨‍🏫 who can’t teach like you do 😂😂❤️🤘🏼

[@spiddyman0079]

Na. It’s because he called the bicuspid valve the mitral valve

[@christineshaw8320]

I think they are nothing different. So why there are those dislikes?

[@moody8386]

mitral valve is also called bicuspid valve

[@kumarsushil3995]

@@spiddyman0079the bicuspid valve is also called the mitral valve.

[@hafeezuddin1367]

@@kumarsushil3995 but the mitral valve is also called the bicuspid valve

[@rivet3300]

I absolutely love this video- you explain these concepts quite well; that makes sense why systole is 1/3 cardiac cycle and diastole is 2/3 cardiac cycle :)))

[@hosearowe8345]

So very very clearly taught ! Not too fast and you deliberately take time to explain Easier to follow

[@ceedee4681]

It's a great video ! It all makes sense now. Thanks a lot for the video.

[@azninvasion1016]

Please teach at my school, you explain it so perfectly thank you, thank you, thank you!

[@hckynrscnd8916]

n't you wish he was your prof?!

[@wassimarnaout]

Thank you very much you are doing a wonderful job, way better than books, it's not boring and it goes straight to the head. Keep it up you're great!

[@siyakhan2576]

amazing...Thank you so much for sharing this video

[@shazminkamali7495]

We learnt this today. And i didnt know half the things she was talking about. This video gets a 👍👍👍 for making me understand!

[@painesville100]

Shared with my Anatomy/Physiology class (8th period- Cleveland Metro Schools: Lincoln-West International School.

[@khanacademymedicine]

Mark Julius Thanks for sharing. Are there other videos/tutorials you'd like to see on Khan Academy medicine that would be useful for you or your students?

[@leaholson76]

+khanacademymedicine Can you make a video of Systole and Diastole broken down into depth, please? It's one of the most complicated concepts to grasp and this video only touches the surface... For all A&P classes we need to fully understand the valves, sounds, pressures, and volumes and waves of an ECG for each (systole and diastole). Making a video incorporating all of theses would be incredibly helpful to a lot of people...

[@MudderFukker-m6g]

Blood flow Acronyms I made up to remember them.... Valves: "To Perform My All" ======== Tricuspid, Pulmonary, Mitral, Aortic T(o) P(erform) M(y) A(ll) ====== Chamber flow: "Real Americans drive RV's from Los Angeles to Las Vegas" RA->RV > [Lungs]> LA->LV-> [Aorta] R(eal) A(mericans) [drive] RV's [from] L(os) A(ngeles) [to] L(as) V(egas) ======== Hope that helps anyone.

[@angel-ik2mc]

+Mudder Fukker Thank you! I'm from Philippines :)

[@aninditasahaxxx5438]

@@MudderFukker-m6g why Fukker??

[@Scott777]

Isn't it amazing how it knows when to open up and close up? It makes you wonder, where does this process of the heart get its understanding from? Like where does the knowledge and intellect come from for the heart to know when to open and close and also how in the world does it have the ability to move on its own in the first place.. kinda mind blowing.

[@NathanRiveraMelo]

The heart is mostly muscle; it doesn't know anything. The reason one valve opens while the other closes is pretty simple. He anthropomorphizes the heart, saying it doesn't "want" back-flow, but don't be confused, scotty. This is all very mechanical.

[@Scott777]

***** The heart is the only muscle that acts automatically without us needing to control it, every other muscle in the body we have control over.. so it makes you wonder.. whats actually powering the heart, like how is it being used, get what I mean..

[@NathanRiveraMelo]

scottyy888 That's a moot point about being the only muscle that acts automatically (I could name several others of the top of my head, including arrector pili muscles and longitudinal and circular muscles in the digestive system.) And the heart uses ATP, just like every other muscle in your body. Pacemaker cells in your heart are constantly depolarizing and repolarizing in rhythmic periods (the rhythm is dictated by ion channels, which is dictated by autonomic stimulation), which sends action potentials to cause myocardium (heart muscle) causing them to contract. Bada boom!

[@Scott777]

***** Yeah I guess that's how all these things are operating but don't you wonder why are they doing these things in the first place? Like where do these cells, ion channels, ATP or whatever get their information from to do what they're supposed to do? Like whats the ultimate purpose of each function in the body, and what's sustaining them all basically..

[@NathanRiveraMelo]

I mean this sincerely - if you're truly interested in these questions you pose then take some classes. Take a physiology class, take a microbiology class, take a biochemistry class; answers will be revealed. It's truly amazing, and I can honestly say it affects me in my daily life as I ponder about bigger picture stuff. Having something of a foundation of knowledge to base my pondering on allows me to guide my questions. And to answer the question about where cells get information from, that would be the wonderful deoxyribonucleic acid molecules in their nuclei, or DNA as it is more commonly known. The other questions (the purpose of each function in the body, what's sustaining them) are sort of vague. And brings me back to my initial point: if you take a few classes about this sort of stuff or even just check out other Kahn Academy videos about cells (I'm betting they exist) then you'll start to form better questions that can guide you in your quest for understanding. Oh, how lovely a thing science truly is!

[@anitabharadia8679]

It's very specific...The teaching is very high standard and also very clear as I mentioned. :)

[@cirenamrac1618]

Amazingly clear videos. Need more views!

[@tonydebaka3967]

wow....the vid is more than 10 years old but it is the best explanation on you tube..job extremely well done. thanks a million

[@Magiccat179]

First of all your voice is so clear, your english is fantastic! Second of all, if I could have two first of alls, I would also say that you explain so clearly what my Professor has managed to jumble up. You are now my mentor.....like it or not : )

[@alexandrajackson776]

Did not understand blood flow, systole or diastole before this video. Very helpful, thank you.

[@karensimmons4560]

Terrific teacher!!!!!!!!!!!!

[@twistyacorda5904]

This explanation is more clear than my teacher. Thanks for the Video. Hoping for more videos about Science

[@Odes1Angel]

The handwriting and clicking sounds are so satisfying. Am I the only one thinking that with these Khan videos? 😅

[@LiaraJane]

your use of arrows and changing colors makes this SOOOO OOOOOOO wonderful! thank you

[@kathleencraigie4703]

Something I heard on another video the other day....on how to remember the different heart valves... All Patients Take Medicine... A, P, T, M.... Aortic, Pulmonary, Tricuspid, Mitral ... :-)

[@minnalyt4277]

Gud idea

[@harshal9868]

i had jst completed my studies,wich took me hardly 25min on other day it would take atleast 2 hours... thank u..

[@srivastavamajjari]

Really it is explained in a very lucid manner..

[@saitejaagepally3647]

You are better than my biology teacher.Thank you so much for uploading this video!!!!!!!!!!!!!!!

[@meltlee9907]

The fact tt this vid helps students after 9 yrs...

[@rebeccagonzalez2407]

Thank you so much! Great video Rishi!

[@lottieblunden]

What a clear and brilliant video- I finally understand!

[@n.sue-ann5527]

i actually understood so much better listening to you than my teacher

[@farhanaislam3387]

awesome vedio....thank you so much

[@lansingday1453]

Thank you, for this teaching! 🙏🏽I've saved this link for future use in...wherever it may find usefulness in my work.. I am fascinated with language/code representation of natural sounds. Music notation and more. For me, the Heart Song could be: lub-DUB-res-tlub-DUB-rest or lubDUB~lubDub~ any manner in which "equal" time is communicated. In my understanding, BPM heart tempo typically describes numbers of cycles per minute (CPM). There's another way which describes ALL beats, in 3-pattern. Thus, 70 cpm equals 210 bpm. I believe it's the later which our bodies profoundly recognise as Heart Song. Extend this tempo into movement, such as walking, running, dance, drumming etc and we can discover great joy.

[@keithrusso-behringer-midas2265]

Thank you for taking the time to explain this sequence. For the first time I now understand my afib. Thank you, thank you, thank you.

[@thetukibird1500]

Whenever I dont understand what my lecturer is talking about I watch your videos instead. They are so much more helpful! Thank you so much.

[@dancenutcracker7502]

Wow this makes so much more sense now! Thank you! Great video!

[@prettybarbie9273]

Thank you so much. I set in a class for 2 hours and didn't understand. You just made it so easy to understand.

[@beenmissing]

i was giving up on my revision until i stumbled upon this. thank you for simplifying things down. you're an inspiration. please continue to upload more videos!

[@camillemarie5966]

Such clear comprehensive explanations. You are a wonderful teacher!!!!!

[@AndreaCsaszar]

Thank you so much for helping me to understand systole and diastole!

[@kari8208]

very clear ,well explained video. helped me so much for m nursing classes. thank you and keep up the brilliant work:)p.s. recommending it to all my classmates

[@robin69banks]

how can blood be in two places at the same time? i really hope there aren't any future doctors asking that question

[@trumanhw]

its in a practically infinite number of places at the same time. A single blood cell however, that is finite. Just think about the subject longer...watch more videos, imagine teaching what you're learning. Thats what I'm trying to do. :)

[@leonelfranco7810]

Systemic Loop and Pulmonary Loop.

[@carolinagerritsenwilliams1493]

Thanks for the video, it was really helpful! My only comment is that the sound that is heard during auscultation is not actually due to the closure of the valves, but what we are hearing is the vibration of blood along the walls and major vessels of the heart. From what my professor taught us, the actual closure of the valve leaflets causes almost no sound. Many thanks for all your videos! - A vet student

[@donmattaarci8766]

this could have been made so much simpler ..you really made it harder then it should be

[@medicalscience1528]

Thank you so much. It cleared my concept .

[@TranscendingFate1]

Khan academy has helped me tremendously through all of my medical prerequisites!! I am almost finished Anatomy and Physiology 2 and I'm number 1 in my class. I could not have done it without Khan. Thank you!

[@munaaliii]

can I get some help from ya? help an aspiring doctor out here

[@pipiwaem34]

very clear! thanks very much

[@JustTayo]

This Man is God sent. Thank You!

[@vickyeastwood9368]

Thank you Khan after all these years Ive found out exactly where systole and dyastole really sit. Thanks your voice is very clear, your logic is easy to understand. Well done from NZ

[@hooyomcnewankujclhay1019]

Amazing explanation. thanks my favoirate teacher

[@taybakhan1367]

Best vedio so far about this topic. THANK YOU

[@ramezberkdar7188]

شكرا جزيلا لك على الشرح الرائع والبسيط

[@nousername5673]

Ramez Berkdar مرحباً

[@CaptainVelveeta]

Super simple...super informative...thanks

[@duramatersoul]

Another fantastic easy to understand video

[@justlisten8705]

I can say nothing coz i m speechless but i can only say admirable and fabulous teaching

[@rayyanmohamed7285]

Wow u explained it so well

[@sivachowdeswar8179]

I have a doubt that whether the sound comes from by shutting the valves or blood hitting the closed valves is my doubt can u clarify

[@gabyvarela9557]

great video! thank you!

[@lavinavaswani3655]

Oh my gosh😳 I wonder how lucidly you explain such a hectic topic...gr8 explanation

[@asifraj321]

Very nice and clear explanation.

[@glitchedcrit3848]

Thanks for these videos, helping so much more than lectures haha

[@aanshusingh8618]

Madeleine's Paige hey you are the one who plays bioshock

[@shuvam712]

You are very nice

[@maria01412]

a huge thumbs up..thanks a lot!!

[@neelkamalgupta8530]

Very impressive video to understand.You just saved my life

[@susanmarshall3555]

I just watched this and enjoy, but I really think you should use a YELLOW marker for a curser.

[@dentaldowntime]

Actually it's the noise of the valves snapping shut. The blood tries to go back the way it came and forces the valves shut creating the distinct noise. If you're hearing the turbulence in the blood, it's most likely a heart murmur. You can check it out at wikipedia.

[@rawanghanem1607]

الحمدلله اني دخلت كلية صحة. شكرا على الفيديو.

[@pepsiprincess48033]

From Ps. 139......WE ARE FEARFULLY AND WONDERFULLY MADE........... I can NEVER get over the sheer miracle of how the same GOD Who created the UNIVERSE created every detail of our bodies.......and, for me, that especially means our hearts and blood........ I am not a medical student or anything.... I just love hearing about and learning about this at every opportunity...... I always have.... as early as childhood...... had a total fascination with the heart and blood...... LONG before there were personal computers.....and YOU TUBE..... and I am so grateful for the opportunity to see so much about this..... THANKS TO ALL!!!!!!

[@awdalysaleh4045]

Thank you very much for your effort .

[@Mr.Everything___]

Thank you good sir.

[@KayliaQuenga]

This helps unbelievably!!!!

[@SuperJSQRD]

Amazing video & amazing voice - I love learning about my heart with your teaching skills, can't stop watching them all.. thank you!

[@jyotichauhan9364]

Yeah! It helps me alot. Thankyou.

[@rimeln6443]

thanks for the great video! you never fail to make me understand something

[@moniquegevorkian8897]

very helpful thank you

[@Noemda]

Thank you, you did an amazing job teaching the heart sounds. Also, you made it fun.

[@shale6223]

You just have to appreciate the true meaning of a breakdown!!! You BROKE that down!!! Thanks a bunch❤️

[@stacyanderson3191]

Great video!!

[@gayanirathnayake8513]

Your the best at teaching... Quick question sir were do you work in I mean your job...❤️😊

[@gayanirathnayake8513]

Because if u work in a campus I will come to that campus ❤️

[@Aschref]

I'm so grateful to you colleague! Thank you for the perfect work! please keep making more medically educative videos =)

[@HankFuller333]

Amazing video..

[@kathleencraigie4703]

We are fearfully and wonderfully made...... psalm 139

[@padaisehikalh9773]

It is a great video. outstanding👍👍👍👍👍

[@tashmikagopal1554]

Thank you so much for this.

[@diplomat2623]

Awesome video. Very helpful.

[@newlizzy213]

excellent Video and explanation

[@mariek6262]

awesome explanation!!

[@Tendy1000]

Thank you for explaining it very well.

[@BEBOTPRO]

Amazing explanation.

[@mohammedwbinmaneea8003]

Thanks,professor. Very clear illustration.

[@_shumayala_khan_]

This was really very helpful ❤

[@najlaaalhinai2099]

what is the program used to make this video ?

[@AntonioGarcia-zr2pz]

Among the best and useful bio videos i've ever seen to be used in High school. I use them in all my classes. Congrats!!

[@loridelatorre2307]

AMAZING INSTRUCTORS!!!! I Love Them! I Love they way they explain the material, how knowledgeable, calm and clear they are! I have listened to other Khan videos for other subjects and I have never been disappointed. THANKS A MILLION!!!!!.

[@kera-oregan]

This is a great video, but it would be great if you clarified what actually makes the heart sounds. In this video I feel like you're implying that it is the closure of the valves directly making the sounds- ie. the leaflets smacking together or something. In reality it's actually the turbulence of the blood created by the closure of the valves that is causing the heart sounds so it would be great if you could add something to highlight this to ensure people don't get confused. Otherwise great and clear video thanks! :)

[@saminatariq561]

u made me laugh....leaflets smacking against each other..lol

[@sivachowdeswar8179]

nice question even I have a doubt that whether the sound comes from by shutting the valves or blood hitting the closed valves is my doubt can u clarify

[@raxorium5851]

Lub is the first sound (S1). Created by the closure of the atrioventricular valves. Dub is the second sound (S2). Created by the closure of the semilunar valves (pulmonary and aortic valves). Flowing of blood (turbulence) creates a different type of sound called murmurs (abnormal). At least this is how Kaplan Medical teaches it.

[@jonnybaldridge]

I had the same thought. Just went over this tonight in my grad patho class. Noise from turbulent flow after closure of valve, not the actual valve shutting. These videos are all so great for visual learners!

[@hckynrscnd8916]

This is what we're taught too. I(I'm referring to Elaine N. Marieb and Katja Hoehn's 2016 copy of Human Anatomy & Physiology 10th ed used for nursing biology).