The Heart, Part 1 - Under Pressure: Crash Course Anatomy & Physiology #25

Your heart gets a lot of attention from poets, songwriters, and storytellers, but today Hank's gonna tell you how it really works. The heart’s ventricles, atria, and valves create a pump that maintains both high and low pressure to circulate blood from the heart to the body through your arteries and bring it back to the heart through your veins. You'll also learn what your blood pressure measurements mean when we talk about systolic and diastolic blood pressure.
Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!
Download it here for Apple Devices: apple.co/3d4eyZo
Download it here for Android Devices: bit.ly/2SrDulJ
Chapters:
Introduction: The Heart 00:00
Structure of the Heart 1:41
The Heart's Ventricles, Atria, and Valves 3:25
Arteries & Veins 4:35
Pulmonary Circulation Loop 5:04
Systemic Loop 6:14
Systolic and Diastolic Blood Pressure 7:58
Review 8:59
Credits 9:29
***
Crash Course is now on Patreon! You can support us directly by signing up at / crashcourse
Thanks to the following Patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:
Mark Brouwer, Jan Schmid, Anna-Ester Volozh, Robert Kunz, Jason A Saslow, Christian Ludvigsen, Chris Peters, Brad Wardell, Beatrice Jin, Roger C. Rocha, Eric Knight, Jessica Simmons, Jeffrey Thompson, Elliot Beter, Today I Found Out, James Craver, Ian Dundore, Jessica Wode, SR Foxley, Sandra Aft, Jacob Ash, Steve Marshall
**SUBBABLE MESSAGES**
TO: My Student
FROM: Earle
Check out / amorsciendi for supplementary content.
--
TO: Everyone
FROM: Magnus Krokstad
Keep dreaming!
**SUPPORTER THANK YOU!**
Thank you so much to all of our awesome supporters for their contributions to help make Crash Course possible and freely available for everyone forever:
Damian Shaw, Taylor Garget, Emily Barker, Librarifan, Damian Shaw, Courtney Spurgeon, juliagraph, Katherine Allen, Stephen DeCubellis, Vanessa Benavent
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[@babynem0]

we college students give you our upmost gratitude. Oh Crash Course, thou has saved my grades.

[@chibiprussia5574]

And high schoolers :3

[@coolperson4582]

And pre schoolers

[@zaydshah8248]

thou hath lmao did u not pay attention to shakespere

[@n-asmr5680]

and middle schoolers

[@ewpls4002]

utmost*

[@snowysannah123]

Guys remember the acronym LAB RAT Left Atria Bicuspid valve Right Atria Tricuspid Valve :)

[@saachigupta2187]

Sannah I Thank youuuuu

[@hexultima9192]

M8, you're a lifesaver! :D

[@hypedhaneen]

Sannah I Omg ! thank you ! ❤👌

[@Rannmm874]

Thanks

[@kaec4393]

Sannah I ❣✅ thank youuu

[@zoranhacker]

Am I the only one who somehow feels vulnerable after seeing how an important thing in my body works?

[@crashcourse]

zoranhacker Definitely not! We've all been thinking the same thing on set for much of this series. -Nicole

[@RoScFan]

CrashCourse Isthere any danger to having two hearts? Because if I had the money I would have an artificial heart installed in my body alongside my normal one, exactly for this reason, vulnerability.

[@josipzubec8892]

RoScFan it would be bad (very bad) and you cant do that becasue you have to connect your heart with lungs first and you cant because you will probably die of internal bleeding and you will have two aortas and where you will connect them and veins and it will not fit in your chest you will have bigger blood preassure and it would just increase vulnerability .

[@komali100]

zoranhacker Humans are surprisingly very tender and can die from just a small part of the body going out of whack. The amazing thing is how our bodies naturally regulate themselves so well that we are able to live. Really, I think the more you watch this series, the more you will feel like, "Way to go, body! Way to go."

[@sacr3]

zoranhacker Don't, the hearts been evolutionarily tested for millions of years and typically the "bad hearts" would fail before the Human could procreate, so the odds of you having a gene that causes heart failure at a young age is all but gone. But your lifestyle will affect its performance down the road, so take care of yourself bud.. I didn't, I don't have a heart condition just yet but i'm sure I will and its not a good feeling to be worried about your ticker.

[@fargin2778]

1. This video enlightened me. 2. This video killed romance.

[@mountainman6645]

Oof

[@toiletpaper5412]

You’re just dumb if you believed that.....only toddlers should believe that

[@astutecultivator2418]

Heartbreaking is real.. your heart has it's own brain cells aswell.. Aztecs, Egyptians and many more ancient cultures knew this but modern western doesn't approve that but more and more were finding that the heart has more powers.. the most important thing to know is that God check ones heart when we die so keep it pure🙏

[@starwumi]

@@astutecultivator2418 te

[@haileymorgan7468]

I remember watching this a couple of years ago for the first time when going through A&P 1, trying for the life of me to remember how the circulatory system worked. Fast forward to now, I'm currently a semester 1 nursing student about to head to my first clinical in a little more than a week. It's crazy how time flew by but I'll always make time for a crashcourse refresher

[@Yoghurt67]

Am i the only one who was trying to find the heart part 1 by Kendrick Lamar.

[@AllisonLujan]

Stop scrolling through the comments and pay attention! You can do it!!

[@MonkeyDLuffy-re9gk]

Allison Lujan realest comment ever. .lol thanks Allison😊

[@seenike7507]

i need a friend like you in my life 😂😂😂

[@Kevessi]

Wow, so accurate. Hope i will get a nice grade

[@claudiahernandez1624]

Lol

[@bryceplant2087]

never

[@blackmesa232323]

This is so heart to understand...

[@SusanWojcucki]

I thought it was arterieasy

[@blackmesa232323]

SubscribeToSyndicate This is a hearty load of information.

[@SusanWojcucki]

***** People really don't valve-u puns anymore.

[@bre97bj]

I will E-ventricle-ly understand this this

[@Pranboi12]

Dont_mindmee its actually quite atri-vi-al

[@buffyclark2968]

I do not procrastinate! My class just started this section today. I watch CrashCourse first, get a general overview, then go into more and more detail. CrashCourse is not just for students who didn't study, it is also for people who are studying.

[@bigsukesakurai]

Can't believe this video alone taught me what I learned for weeks in school... and more!

[@coolparrot9432]

totally

[@sofiailardi8826]

Who else is here from teachers not wanting to teach during corona, so letting crash course teach us instead?

[@nuriawilliams6680]

haha yes

[@andy-zb4dd]

XD I am

[@georginahanna8344]

"Teachers don't wanna teach, because of corona" Like its their choice. I'd rather stay alive than teach if I was a teacher

[@Fantasyvid]

im a nursing student, and i paid 89$ for this online course for learning anatomy & physiology but your videos often give me a better, more overall understanding!

[@LDJ27]

As someone who's had heart problems her whole life, this made more sense than anything doctors have attempted to explain to me, so thanks for that! Really helpful :)

[@emmamoller8845]

How to break a heart (let it go) The heart on call 24 hours a day. It is work all throughout the night. If it sounds like walking on cold snow. We will rush you to the ER. It's building pressure up inside. Gonna let go, through the atrial valve. Don't eat that cake. Eat healthy food. Go to the gym and skip the chips instead produce. Otherwise you heart is screwd! Let it be. It will beat Even if you don't think of it. It is your true love. Whiteout it you would be dead now! It dosent care about what your crush just said. Its only job is keeping you alive. Hey Hank I expect you to sing this on at least one of you channels. This video gave me goosebumps. Guess I made the right choice to be an MD! Love heart sounds.

[@sakimaos.3470]

whenever im listening to this guy, i always feel the need to take a minute to catch my breath even tho i dont need to, hes just talking so fast it feels like hes not breathing lmao

[@water3252]

shiyakiisa S. They cut out the extra time between sentences

[@Lardianyt]

Dear John, I've been graduated from high school for 5 years now (god it's been so much longer than it feels), and I recently was reminded by you that it was you in crash course all those years ago. I downloaded all of them and am now listening through it during work, learning is fun when you're not being forced to.

[@13luckoftheirish13]

I'm a medical student and have a pretty strong stomach for most things but for some reason I just hate hearts - to the point where I've passed out dissecting one. It seems so irrational considering the importance of our and the fact that other organs are absolutely fine for me, but the thought of hearts or the just hearing the sound they make makes me freak out. Great since I'm going to be a doctor, amirite? Loving the anatomy series, helps me recap things I've learned and is funny and interesting. Wish I had these videos back when I was doing my A level biology.

[@fatimaakamrann]

Good luck with being a doctor!! I am starting my A levels next year 😅

[@exceldivine]

Did you graduate? If so Congratulations! And Cardiology or Cardiovascular wouldn’t be for me

[@itswarhawk]

I want to be a doctor but first I have to do ma A-levels

[@sammidee1176]

bwahahah! I am trying to get into nursing school and I feel the same way. Im so glad I am not alone!

[@Blackie919]

i passed my anatomy class becuz of these videos from crash coarse, thank you for making crash coarse available and free .. i love your voice btw and your fun personality. from NORTHDAKOTA

[@sheridildar5840]

I like his voice and presentation, wish my teacher was so amazing

[@zoerobertson7827]

+Faiza Issa am also passing my anatomy course because of his videos! this is truly an amazing thing to have

[@Zetsuke4]

his coarse voice

[@justanotherguy3348]

Did you fail English thought? :>

[@phranzarteche6085]

oooh ohoohohoh oho oohohohhoh BURN

[@kimbalasanyan7111]

Who else spent countless amounts of money on tuition and text books just to learn the most from a free youtube video ?

[@claytonmoorman]

"Tri" before you "Bi"

[@xopamjones]

only way i remember it. you gotta try it before you buy it

[@chaosxfear3824]

Clayton Moorman 👏👏👏

[@feliciachi9719]

Had a heart

[@lauragadille3384]

My tutor taught me this

[@michaelbrown5633]

He didn’t say anything about Biscupid though

[@user-gv4bf4zx2s]

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.

[@jasminep1106]

thnks

[@laplacesdemon82]

Mudder Fukker just don't remember, just understand why it has to be so

[@user-gv4bf4zx2s]

I do understand, it's just some mnemonics I made up to remember the formal names.

[@yhm4325]

I really have been have been helped. I write exams next month and I really think my class will love this. Thanks so much!

[@mymidgetbae184]

Cool

[@nerdfighterhk9529]

Hi Crash Course! We've translated this episode's Chinese subtitles! Hope you can take a look and allow it to be displayed. Nerdfighters, let's make Crash Course more friendly to every learner :D DFTBA! P.S. last time we translated subtitles, they were never put up, so we really hesitated to try again since it took lots of effort and time:( let's hope they are not so busy this time :(

[@tandrewsbliss745]

Who's also last minute studying before an exam?

[@dottyjyoung]

"I love you, with both my kidneys." - - Mark Lowery

[@DOMtheGrasshopper]

"Oh baby, you make my liver quiver" 😂

[@TaiChiKnees]

And this is why I love you! My pharm students start drugs for angina and heart failure tomorrow, and then I'll have them watch this, and then we'll do hypertension next week. You folks save me valuable class time (and time I would spend making my sad little videos) that I can now use for active learning and case studies. Thank you, thank you! I do also like that you include little shout outs to pathophysiology like the effects of long term hypertension and congestive heart failure. It makes learning the A & P so seem much more relevant to students starting out in the health sciences!

[@hanks4655]

"So if you put your ear against someone's chest... And yeah. Ask for permission first." (HAHAHAHA!)

[@sadmac356]

I love that and the "I don't have a watch" bit.

[@pedalwerk]

My mum actually did this to her mother, and heard a gush when you should hear a thud. She was later diagnosed with a leaking mitral bicusbid valve which required surgery and implantation of a pig heart valve. Had my mum not done this, it is quite possible that my grandmother would have died years earlier.

[@brokenglassshimmerlikestar3407]

Used to do this a lot to my parents when I was little. Just lying on them listening to the heartbeats. It's a shame we grow up and don't get this type of intimacy any more. I'll need to put my ear against my boyfriend's chest next time he comes.

[@tre-moon-dous6122]

Such an amazing time to live right now. to be able to learn about the complex heart in a very simple and understandable method..thank you

[@snkit3436]

B32 B33 1:53 2:21 2:33 3:25 5:09 6:00 6:34

[@crashcourse]

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App! Download it here for Apple Devices: apple.co/3d4eyZo Download it here for Android Devices: bit.ly/2SrDulJ

[@johnwood7529]

CrashCourse great app

[@kyliesmommy84]

Hank, thank you. Truly. From chemistry, microbiology and A&P. You’ve been there for me. I’m grateful

[@allisonbaums788]

whew this guy makes me nervous, but the info is spot on!

[@shoutvillarreal3552]

THIS IS SO DANNK

[@pawned79]

A thank you to Crashcourse on behalf of parents! I have been showing my kids your videos for years, and now my oldest is in middle school and participates in all sorts of STEM activities without any direct pressure from me. I’m now showing your videos to my kindergartner, and will be doing so for years to come. Thank you again, and happy holidays.

[@Alyssa-og3qs]

only 40 seconds in and Hank has already crushed my soul that the heart does not care

[@browneyedgirl222]

thank you so much crash course team !! ❤❤❤

[@TheFireflyGrave]

Our blood is never blue? My world is shattered.

[@adelajaini5019]

TheFireflyGrave The diagram in my science textbook in primary school had the veins in blue and the arteries in red to make is clear enough to see the difference,

[@rockingtundra2830]

TheFireflyGrave I heard that it’s possible to have blue blood if you have too much copper in your blood

[@qwertzystone5654]

kendrick lamar reference

[@zarahbrookes492]

Hank Green - teaching me more than my lecturers and prescribed readings ever will. You're a wonder!!!! 💕

[@YoungBuddhaEzuk]

Bruh these videos are the best for a quick review

[@HALOUNSC2552]

Anybody else started to sing "Under Pressure" when they saw this video uploaded?

[@lilypippili]

I DID

[@GuyWithAnAmazingHat]

HALOUNSC2552 This is the natural thing to do.

[@Azzarinne]

HALOUNSC2552 No, but now I am! XD

[@crashcourse]

HALOUNSC2552 We totally sang it on set shortly before the wrap up. (Unfortunately, not while cameras were rolling, so that one won't make the outtakes. MISSED OPPORTUNITY, I KNOW.) -Nicole

[@Kryptoche]

HALOUNSC2552 YES

[@jam_avery3220]

I am a Nurse and a health professor at a local college in London, Ontario. I think your video's are fantastic Hank!

[@Drummer4God777]

These Anatomy videos are saving my life! Thank you for doing these, they're very helpful and make everything so much easier to digest!

[@weliakayonara1609]

I'm from Brasil! I'm loving this channel! 😊

[@kraftdinner4202]

You saved my ass big time

[@kraftdinner4202]

+Bjørn Gryttingsodegaard or Blood Pressure

[@raza838]

+Bjørn Gryttingsodegaard saved me on my last A&p 2 exam lol

[@kraftdinner4202]

+Alix Graham Same here!

[@quickandfastg.k.1137]

same

[@kikitaa1ify]

Bjørn Gryttingsodegaard saaaaame!

[@iluvDNA100]

If people's hearts actually broke when their date dumped them, we wouldn't have to deal with an overpopulation problem.

[@RoScFan]

Joe Seph People really need to start to grasp the fact that overpopulation is coming from 3rd world countries. Western countries actually need a higher fertility rate to just continue existing.

[@iluvDNA100]

RoScFan

[@RoScFan]

agentrikamcgee It's not growing. If anything, it's aging.

[@juliarose7236]

agentrikamcgee it does have one of the largest populations, but the population growth rate has been steadily declining for decades.

[@bre97bj]

If that was the case love would merely be an existing emotion (starting from the early humans) according to Darwin with survival of the fittest. It wouldn't be passed down.. So it would be no love in the first place

[@stevendv8487]

7:19 "heart to lung to heart to body to heart again" nice rhythm in an episode about the rhythmically beating heart! :D

[@vanessamonroe5508]

You helped me get an A in A&P in nursing school last year thank you !!,

[@dallasvalento1906]

I learn more from crash course then I do from lecture!

[@korolak56]

You're saving my life this year, I honestly can't thank you enough for this series!

[@bluebird4417]

Crash course, giving you the cold hard truth of emotion since foreverrrr

[@Wowhondor]

Always saving the day! Thanks

[@sierralobo7163]

4:08 With the valves opening and closing...The heart looks like it's having a party. XD

[@lawrencecalablaster568]

Sierra Lobo I thought that too; it's like like hand-clapping valves :)

[@muhammadarshiya633]

thankyou guys for the all the work...its really really helping me and my friends to study without getting bored.if any of us have any dought in histology and anatomy we clarify it through your videos...thanks a lottt for your help..and keep it up with it....

[@davids.5083]

Hank, these videos have really been helpful for MCAT review. Thanks for your work!

[@maryanthony5661]

You are the reason why I pass A&P, thank you!

[@joslynhouston5842]

HANK YOU ARE THE MAN!!! Thank You from the base of my heart!!!!!

[@jeseka9586]

I'm pretty sure Hank could write a song on that! xD

[@crashcourse]

Jeseka C Christieson Probably true. -Nicole

[@NadaMoya]

+CrashCourse I highly disagree with you regarding "the heart is just a pump". Science is still not sure if the heart feels or not. But recently many researchers cannot explain why heart receivers feel and change their beliefs just like their heart donors. However, I believe that heart actually controls our brains through neurons connection and I can't wait to prove this via lab experiments.

[@Clips4Yall]

+Jeseka C Christieson If you is interested in human anatomy the greatest success that I have had was by following the Anatomy Blueprint Pro (just google it) without a doubt the most incredible info i've tried.

[@breadgenie9640]

+Nada Alsuhebany heart donors? Then how do the donors live? Is it even possible hahah

[@chris7247]

Yes, it is possible. And no, they don't live because they're already dead. Heart donors are people who have recently passed away and gave their consent before they died.

[@cynthiajimenez4387]

Love these videos, my A/P professor moves so fast through concepts and these videos break everything down so easy! Thanks for making them for the greater good!

[@calebshedd1732]

This is such a great explanation! I had to watch it on .75x speed to catch it all. Thanks!

[@cecilyngoka9677]

the heart is pumping the blood in our body Cash Course is a good understanding of the information and explains the heart.

[@RodrigorReyes123]

My favorite crash course video hands down.

[@DDIAZ-we4dz]

I'm not religious but. You guys do the lords work! I learn more from you than half of my professors

[@belindalucas5468]

Thank you, thank you, thank you. Crash course is the best. I've learnt so much from these lessons.

[@too-hot-to-handle01]

Perfect, Hank. Thank you team!

[@Im_Just_A_Dreamer]

8:59 You could write a song about a heart back in high school trying to write its chemistry final! :) That could work! :)

[@nicotinekitty1275]

I LOVE this channel! I’m so glad I came across this. So knowledgeable and easy to absorb. THANK YOU!

[@nottNitesh]

I’m 14 but watching this I know a lot about anatomy but tips help

[@topherheawl3994]

I'm a Physiology PhD with a CV exam tomorrow and the most valuable 10 minutes of my studying has been watching this video. Even material that goes into in-depth biophysics and abstract concepts is given great context by this refresher. High schoolers and medical students alike should watch this when preparing for any cardiovascular exam.

[@emmakearney8956]

quick tip for ya'll who have a hard time watching it cuz he's going to fast: change the speed in the video to 0.75 and he's actually talking at the speed of a normal human. Really helped me out

[@heavymetalnhardrock]

Kendrick been real quiet since this dropped

[@wandimaree7503]

This channel is my last chance to pass my test tomorrow. pls pray for me

[@amenahshahin848]

This year I've seen Hank and fellow crew from Crash Course more than I've seen my own family.

[@mgichndz]

THANK YOU! I’m a visual learner and you helped me see what I was trying to learn, but unsuccessful, through my medical books. 🙏🏽🙏🏽🙏🏽

[@SpunkyGrubber]

I am currently a nationally certified EMT and felt I needed to brush up on my cardiac knowledge. This video was very helpful and your personality kept me interested (: Thank you!

[@whistlestoppress4643]

thanks hank and the gang! i have to take my hesi next week and the heart (and the endocrine system) is super complicated to understand from my textbook alone.

[@hellocloverkitty]

Thank you! This will help on my quiz tomorrow! I was studying all the words but didn’t really understand them.

[@veronicadots]

7:43 skrillex! you guys are at a whole new level of awesome :)

[@ayatoyuri9498]

i love his accent, it makes it easier and nicer to listen to biology facts 😂😂😂

[@jamilabalde5235]

CrashCourse should have a learning game app, I would play it all the time!

[@Chunks2599]

Saved my life once again !!!! THANK YOU! You explain 1 hour lectures in like 10-15 mins!

[@veronikafrolova8442]

I learn so much from these crash courses. Lectures at my school are too short and boring. This crash course I watch with such enthusiasm. Just love it. Thank you for making A&P easy to learn

[@KevinMCoring]

Just had my Aorta repaired in April, take care of your hearts guys, it's not fun to get cut opened

[@KevinMCoring]

John Hassel thanks man! I was out of the game for a month

[@murrietazgirl]

Kevin...could you send me an invoice again?

[@silentwings9317]

The heart is amazing 💝

[@roseloveslove]

I always watch these videos before an exam x)

[@Rumil_]

Anatomy test in 30 mins, having this play as i get ready to leave

[@zephyrvescent]

I hope Hank sees this! What's the Point? My heart, your heart... they all look alike, two puffy mounds at the top, tapering down into a spike. But just why is it that they all look the same? Shouldn't a person's heart be as individual as his name? Well, if you look a bit closer you will readily see that everyone's heart is just as different as he (or she!). For it's not the shape, nor even the size, But what's inside that is truly the prize. The mound on the right... holds memories so dear only the good ones from year after year. And the mound on the left, is filled to the brim with the light of sweet passion, that never grows dim. Now the part in the middle, is where deep love resides. Its strength can be fierce, Yet here, too, fragility hides. Then finally, slowly, the heart slopes to a fine edge.. coming to a sharp point in the shape of a wedge. This point is for balance between all the parts which is very important for those with full hearts! And if you look more closely you will see right at the tip a tiny little hole no bigger than a pin. This is the place where all our sorrows go They stay with us a short while, then seep out with the flow. Hearts can be lonely, Hearts can be sad... Hearts can be faithful, In good times and bad But no matter the shape, Nor how big or how small, Your heart is a gift, To be shared with all.

[@vanessaustanny8320]

this is golden

[@RyogaEchizen]

meh

[@austinbateman4997]

nice

[@Tea_Tales_Travels]

+

[@peregrinasantos7133]

nice poem

[@doggonemess1]

Classic Super Soaker FTW! I had two of those.

[@preetk8458]

Loved it! Happy to learn to it from you sir

[@sandervangaver7714]

I'm studying to become a teacher (biology and English)... but I'm not a good student myself. It's always a lot easier to start looking at these videos than to start studying. This is actualy exactly my subject matter so I guess you guys are helping me out here.

[@DemmiiKnoll]

Just started my Health degree at University and honestly you've helped me out SO MUCH!!! You're awesome (:

[@constrictedconstitution6451]

I'm doing this in primary school (Australia)

[@PinkChucky15]

I remember learning about this in my Biology class in college, I was fascinated then by how the heart works, and I still am. It's really an amazing organ.

[@lim9551]

Loved that chart at the end. Helpful! ;D

[@willsmiththeiron5007]

heart works about 80 years ( if youre lucky 100 years ) aaaaaaaaaaaaaaaand then it says " fu*k this im too old for this sh*t "

[@RyogaEchizen]

yeyyyyy very funnnnyyyy

[@JasonKibbe]

Courtesy of ChatGPT: (Verse 1) I had a broken heart, I thought it was love But it was just my blood pressure rising up above I thought I'd never mend, I thought I'd never thrive But then I learned to manage, and now I'm feeling alive (Chorus) I've got a broken heart, but it's not from love It's from high blood pressure, from stress and stuff I take my meds and I watch what I eat Now my heart is mended, and I'm feeling fleet (Verse 2) I used to worry all the time, my stress was through the roof But now I take it easy, I've learned to be aloof I exercise and I eat my greens And now my heart is healthy, and my blood pressure clean (Chorus) I've got a broken heart, but it's not from love It's from high blood pressure, from stress and stuff I take my meds and I watch what I eat Now my heart is mended, and I'm feeling fleet (Bridge) Don't let high blood pressure bring you down There are ways to manage it, don't let it get you down Take care of your heart, and it will take care of you You'll be feeling healthy, and your heart will be brand new (Chorus) I've got a broken heart, but it's not from love It's from high blood pressure, from stress and stuff I take my meds and I watch what I eat Now my heart is mended, and I'm feeling fleet

[@saeed7632]

please do cardiovascular disease.

[@pimsinghatiraj74]

THANK YOU

[@andreshuertas7122]

I just love your videos, I am a fan of Crash Course History, but medicine and biology are also great. Keep pushing hard on knowledge guys, greetings from Colombia.

[@shehzernaumani5486]

all about the LAB RAT, Left Atrium bicuspid, Right Atrium tricuspid

[@RicardoSanchez-jo4yo]

Thank you so much bro! All these videos have helped me in my pre-med courses, and all the scishows keep me entertained when I'm not studying. :)