The Heart, Part 2 - Heart Throbs: Crash Course Anatomy & Physiology #26

[@YashendraShuklaTheOG]

So you are telling me that to fix a heart I need to turn it off and on again?

[@MakeMeThinkAgain]

Yashendra Shukla And clear the cache.

[@monj5492]

LMAOOO this needs more thumbs up

[@r.darling4135]

sir, you win. truly.

[@ObjectiveZoomer]

hahaha if you tried turning it off and back on again. I can see it now going to the doctor have heart problems doctor says have you tried rebooting it

[@scare-a-medic9112]

Actually you can and I have. I'm a paramedic and you can actually "shock" cardiovert a persons heart that is going intoV-tach or Supra ventricular tachycardia. It is very painful but often necessary. When the ventricles are fluttering they need to be restarted. You can shock the patient or we have drugs that can stop your heart for two seconds, hoping it returns to normal sinus rhythm. We use Adenosine if the patient is still awake and speaking to you instead of using the paddles.The patient will actually tell you they are dying. The drug allows the SA node or AV node to stop and restart. From the couple patients I had to do this to said it is very painful. Luckily we can provide comfort and analgesic medications before hand.

[@clarecornelius9068]

honestly you're not a youruber, you're a genius and my friend and you save so many people from long sleepless night and stress. It really is inspiring just being able to watch an 8 minute video and understand an entire month long unit... i hope you're a teacher somewhere because the world needs your help... and the students need more teachers like you. If all teachers were like you there would be no need for textbooks or workbooks or anything because all of that is stored in your brain. I can't even describe with words how thankful i am for you and your videos hank. thank you. #thankshank

[@nicktube8825]

What school do you go to where you spend an entire month on cardiac conductivity in this depth...

[@Assaultpro18]

we barely spent a week on it and im in highschool

[@noorbadran5563]

Clare Cornelius well said i agree

[@JuanRodriguez-dm6hv]

You obviously aren't a genius either, can't even spell youtuber

[@ritvikmiglani]

aaaaaand the buzzkill arrives. Typical of youtube comments

[@mandyd4051]

Passing A&P 1&2 for nursing through these videos!!! I study our given material and then come here to have it all make sense. It truly helps me envision the many A/P processes. The creator is seriously genius! Pictures and stories are everything. Thank you!!!

[@ObjectiveZoomer]

You realize that Hank just summarizes and presents information right? Like he doesn't know this stuff

[@JenniferJiang2013]

@@ObjectiveZoomer I think everyone here knows that he has a team behind him but remember that the Green Brothers created Crash Course.

[@JLSmusician]

I’m in A&P 2 online right now and this is a life saver! I’m also taking this class for Nursing school!!

[@cuteodalys]

Omg congrats !! I’m trying to get into nursing but hopefully I’ll get accepted this year I’m currently taking A&P 2

[@MakerBayfield]

Dallas G you’ll get it, were all routing for you!!

[@dayennyd1062]

Using crashcourse to cement the information that I have been reading while studying for the MCAT. Thank you for your genius webseries. I'm a visual learner and it helps me so much to see the things that I just read! =D Love the cartoons & examples. Just so you know, when I'm a doctor I will fund you guys...please never stop! LOL.

[@jinx7501]

"Confused? Well I'm here to help your head understand your heart." Speak, wise one. We listen in desperation. Your words can teach more in ten minutes then the last 3 weeks (9+ hrs of just lecture, not counting lab) of class.

[@Y2KNW]

I gave someone CPR for nearly 4 minutes, I was about ready to try that whole "Don't you die on me bit." Thankfully the people who knew what they were doing showed up and got him to a hospital in time. I really hope to never have to do that again.

[@TaiChiKnees]

+Y2KNW Well done! Doing CPR is extremely hard work!!!

[@PleaseEnterA.Name.]

My dad did it for like 30 minutes... that is a LONG time but there was no help available so he just kept going... person didn't make it.

[@冬-01]

RIP

[@cuteodalys]

i get to do those every other week. People in my town seriously have to stop odeing it’s sad to see those pass but there are some who survive.

[@iyoyoyoyoyoyoyo]

@@shadowsweetheart7188 in Indonesia it's 30 mins because of ethical issues

[@sarahleonard7309]

I was repeating what I learned in this episode to my teenage son over lunch one day. He paused for a moment to pensively chew his food and said, "So... they use the universal solution of 'turn it off and back on again'?" I almost choked on my chicken with broccoli! Also, I love that boy!

[@TheDallinatorX]

As a Tuba player I know that the trumpets are the first people off beat and the triangle never was on beat.

[@ronninator]

I LITERALLY Laughed out loud, why doesn't this have more likes!?!?!?!?!?!?!?!?!?!?!?!

[@soojongha6381]

It’s cuz all of the trumpet and percussion players downvoted this

[@aquauqa3649]

What about cornet and horn players?

[@islasmila7383]

believe me, its a lot trickier to come in on time if you're playing more than just 120 bars of low crotchets

[@deannadurben1117]

I loved 1:09! "I'm here to help your head understand your heart."

[@louasgabeson2860]

Yooooo, this new kendrick is 🔥🔥🔥

[@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

[@shikhanshu]

the comprehensiveness of your videos amazes me.. you explain every single thing in utmost detail going down as deep as possible.. no dumbing down of any concept.. THIS CHANNEL IS SIMPLY MINDBLOWING!

[@QgabrieleQ]

i came here to have a good time and then the mcdreamy thing hit me like a truck get it i cry

[@EliaquimGuedesCrispim]

Yep :(

[@juladyb5214]

Gabrielle - to me it was a spoiler so i'm crying extra 😭😭😭

[@caitlynhill14]

At least it wasn’t a bus

[@guysarehorny]

Too soon 😭

[@Rickytikkitavi]

He DIES LIKE THAT!?

[@selmansogut598]

Very nice video except for one thing. You don't always need a defibrilator. Not every cardiac arrest is caused by ventricular fibrilation or pulsless ventricular tachicardia. Ventricular fibrilation and pulsless ventricular tachicardia are shockable rhythms and you need a defibrilator when you see one. But some cardiac arrest victims have pulsless electric activity or asystole. These two are called non-shockable rhythms and as the name implies, you can't (shouldn't) try to defibrilate those. So, you don't always need a defibrilator.

[@alyssa2123]

I was getting ready to make the same comment. I wish they had clarified this common assumption. He did acknowledge that there were misconceptions, but didn't address what was wrong.

[@SuperRudek]

alyssa2123 Exactly! I was waiting the whole episode for Hank to say that you can't shock a flatline, and that fibrilation doesn't show like a flatline on the monitor. We should inform Hank or the writers of this because it's just so wrong.

[@BattleNuggetz]

Thank your for elaborating 👌🏾

[@DeeGil]

So what do you do if it's non-shockable??

[@lanphil64]

For the people complaining about him talking fast Put it in .5 speed. Sure, he sounds drunk, but you get the info in the pace you want 😂

[@GingeredHonii]

that drunk voice dou XD

[@nasreennaaz1833]

how to put ob speed .5

[@SocialNormz101]

He doesn't talk fast people just listen slow, lol

[@GingeredHonii]

Fox Hunter i just like his drunk voice LMAO

[@antheabagley2601]

or watch in 1.5 for a while then put it back to normal, vwala, sounds like hes talking normal speed

[@allidurdin]

Hank saving my life with midterms. Learning a whole chapter in 9.5 minutes when my professor spends 3+ hours explaining it LOL

[@johnpaul2522]

RIP McDreamy

[@carlybelcher9860]

Excellent orchestra metaphor!

[@suzannevolpe2747]

Thank you very much Crash Course for teaching me physiological systems when my instructor fails to do so! My kids are watching the kids channel too and they love it! Keep up the GREAT work!

[@gregarmstrong2500]

That was probably the most fascinating thing I've ever watched on youtube. Thank you.

[@Abominatrix650]

I don't even watch Grey's Anatomy but come on! Spoilers, man!

[@hannahaicker7731]

you literally made my day! :D

[@JustinVentress]

Right!?!?

[@hi.4611]

Loool! I feel your pain 100% 😂

[@blackmesa232323]

This is a hearty load of information.

[@babatundeadefila6734]

Good joke

[@fuserkobejr]

i can watch these all day if i had the time :)

[@Raki_B7]

That wasn't a terrible joke! It made me laugh , and it makes sense lol.

[@babatundeadefila6734]

Raki B Exactly

[@x0Reisa0x]

These videos are getting me through my first weeks of med school! Thank you so much CrachCourse :)

[@phoenixlazura8999]

You remind me of Doctor Who. Thanks for your vids, they saved my life for AP test.

[@SuperMario64nation]

The Fact that Hank just used Greys Anatomy references, practically just made my life.

[@chelseabrown3336]

60 page chapter broken down in 9mins.... I thank you hank!!!

[@maryaneholt370]

I've been trying to study the heart by looking on wikipedia and memorising parts of the heart, and then I watch two videos and know how the heart pretty much works, lol. Very good videos, thank you.

[@abood2010ize]

tomorrow is my term exam, I am banging my head to the wall because i didn't find this brilliant channel earlier, Thank you so much for all this, you set my mood to harmony!

[@keshavbansal6201]

hank you are the not the hero we deserved but the hero we needed

[@jetson_]

Closed my EMT text book and typed in “crash course physiology” oh thank God for Hank and the graphics team.

[@hi.4611]

“And McDreamy... may he rest in peace” 😂😂

[@cecilyngoka9677]

ok, part two is the heart because if you can't not breathe in and out the membrane.💜💜💜💜💜💜💜💜💜💓💓💓💓💓💓

[@CiNdyO3]

First you had my curiosity...but now that Dr. McDreamy is involved you have my attention 😍 😄

[@lilianarogel6063]

Thank you so much for the video! I'm currently taking anatomy and physiology and we are studying about the heart and this has made it so much easier to understand. You are a genius and keep up the good work!

[@quyansmity]

This is probably one of the most helpful videos I have ever seen. Thank you so much for breaking everything down.

[@drkirthigamurugan]

Chanceless lectures! Means a lot since it gets everyone out f sleepless nights and sorts out confusions within no secs!

[@chels5174]

Gosh I love these videos so much

[@easdas1]

So many greys anatomy references.. im already a fan of this cc series too!!

[@stoneroses3493]

"And when McDreamy (may he rest in peace), finally bursts open those paddles" LOL love the GA reference

[@edwinmartinez6352]

If only this wasn't explained in such a rush, more people would understand it

[@The_Admiral5]

About to start my Cardio 1 module in med school tomorrow. These videos are really awesome to get a quick review in before classes start!

[@christofferenfors3676]

Loved the spoiler xD Watch out Hank. People who watch Grey's anatomy aren't normally associated with emotional stability! Break out the torches and pitchforks folks!

[@slpk]

7:17 Pretty sure we're gonna see some hilarious bloopers for that one!

[@LittleSolarSystemOfficial]

***** I certainly hope so, especially an animated one!

[@lizzyyang5356]

OMG HE TALKED ABOUT GREY’S ANATOMY I FRICKING LOVE YOU ♥️♥️♥️♥️♥️

[@farahm1469]

You are a LIFE SAVER in the midst of my university being online due to the virus!!

[@isabellamunoz1099]

lol thanks for the spoiler! I'm still on season 10 :(

[@rosesourceful]

im so pissed me too

[@MrSokkrokker]

AHHHHHHHHHHHHHHHHHH

[@danichan33]

SO NOT OKAY :,(

[@chrishall3475]

I'm on season 2. Ugh.

[@kaelapollack9013]

im on season 6 :(

[@misshiss23]

Hank, you're a legend!!!! Seriously so grateful for your teachings

[@peterarnold475]

INTERESTING FACT: The sinus node gives the rhythm for the heart pulse, but also the nervous system and hormones regulates the pulse. If the heart with its sinus node is isolated from the rest of the body, the heart beats about 100 times a minute.

[@NikitaDalal0604]

Complete heart in 9.33 minutes!! Super awesome!

[@docopoper]

Now if only somebody could explain why game designers think defibrillators are a general cure for death.

[@TheSignetGamer]

docopoper Because- alternative? I'd say its just the universal sign. It represents it to anyone looking at it. If pads are in a game, chances are they are more a deus ex machina rather than an accurate medical device to necessitate someone with 20 bullet holes, which I am not sure exist or have a real equivalent.

[@navidmohammmadpour3751]

hank, you deserve a medal.

[@lougert]

While the conductor metaphor is great for understanding this concept, I would like to point out that a good ensemble will generally not fall apart simply because the conductor stops. Plus, it's a baton, not a wand. (I know semantics, but I'm a music major, so yeah.) Thanks for the episode, regardless! :)

[@sledgehammer-productions]

I like the 'wand'picture though, for non-musicians it's kind of magical (I studied conducting, I can tell you, it's just hard work (and some magic :-) ). I like that he's talking about HER, too little female conductors out there!

[@lougert]

Haha it is fun to imagine that you're a wizard or something! Yeah, I did appreciate that! :)

[@ronninator]

same

[@ObjectiveZoomer]

It's a gay little wand

[@Meowology]

Cardiophiles are gonna loooove this series

[@volthamdan1339]

I cant describe how thankful I am for you and all who helped making this channel work man you’re a life saver am passing in college because of you and taking all basics I’ve forgot and learn new things because of you thanks man you’re the best

[@baba2012100]

I may not absorb it all, but I always learn something from these videos!

[@mohammedalkasas654]

someone give this man a prize

[@ruthike7508]

The Grey's anatomy reference 😭😭💕

[@douglasm.sodaro7579]

there is nothing better then crash course!!!!!!!!

[@PinkChucky15]

The heart is definitely one of my favorite organs.

[@ACE-bd1yh]

I JUST STARTED WATCHING GREY'S ANATOMY I KNOW I'M ALREADY WAAAAY BEHIND BUT HANK Y U DO DIS?!?!!!

[@valeriaarroyo]

God bless my dude hahaa i have an exam today and i needed to crash course this unit. i know most of the material but i didn't get to study study bc life happened..so this is really helping me before my exam!

[@ginnym6733]

These pictured videos are everything. Thank you so much

[@peacefulibra8219]

im kind of upset about the spoiler for greys anatomy. dishonor on you, dishonor on your cow, dishonor on your family. shaaaaaame. Thanks for the video though.

[@MyJaden007]

Thanks a lot to the whole CrashCourse crew, without your wonderful free education, we would've had to pay tons of money to private teachers to get a little knowledge.

[@valerievazquez1248]

Thank you so much Hank! Your videos are helping me with my intro to human anatomy and physiology class during this quarantine.

[@MoonGodd3ss]

You make everything click, clack and snap into place!!!!!! THANK YOU!!!!!

[@shenellsmith6849]

I am very grateful for this channel

[@randomtinypotatocried]

This is definitely a good refresher for my EMT exam that's slowly coming up.

[@boryanaadcock4805]

Hank, you must like watching Grey's Anatomy. You are certainly up to date as what's happening in the show. Love your work!

[@kaelapollack9013]

yall gotta put in soiler alerts im curently crying over george you cant tell me derek dies too

[@1990Sapphire]

That RIP McDreamy was uncalled for 😭

[@EdenNov]

4:23 If the ion channels of the pacemaker cells are always open, how can re-polarization occur?

[@888167]

bro your videos are so good it's not even funny. If you would go more into detail it would basically be the best physiology class i've heard.

[@brontealston3766]

That orchestra analogy was just... wow. Thank you

[@bassoonalto18]

completely unrelated to the content of this video --which is awesome, btw! Learned a lot-- I love your strong mad on the table!

[@adambuchbinder2791]

This is fascinating! If the SA node controls the pace of your heart, how does your brain make it go faster or slower? Maybe by changing the environment at the node so it depolarizes faster or slower? And if the SA node controls the AV node, what does it mean for the AV node to have its own rhythm? I suppose I'll trawl Wikipedia from here. So many questions!

[@leukocyteofdoom]

used to watch these as a student, now im a cath and EP scrub tech.. CRT-Ds here we go

[@baruktaye6644]

he knows alot about the body parts

[@anonymouswolf7396]

I learn more from this guy in 10 min more than learn in 1 week

[@valeriatsakkiri6904]

His amazing saved me so much time. If he speaks to fast for some people try to change the speed on 0.75 is actually not too slow but no to fast ether

[@Amal-ns6ss]

i recently started watch gerys anatomy and hank just spoiled it for me. i didnt know dr shepherd dies :)

[@ambreellison5746]

Good information. Important to state that if someone is in cardiac arrest, no need to defibrillate, there is no electrical activity. Push hard and fast. Defibrillation only works when there is something to defibrillate.

[@sruthisunil2237]

crash course is just....AMAZING....

[@susannajw87]

Thanks for crash course, you guys are ace!

[@ianreddish1878]

Ah yes I used to love the best medical show of all time 'ER'. George Clooney with his classic line "supraventricular tachycardia arrhythmia"

[@christyharris4382]

Thanks for breaking that down.

[@DuyNguyen-ks8dc]

he is just the best teacher :O

[@naturalfay2798]

You are too funny LOL ....but it make this enjoying to watch instead of dull I s learn alot when I listen keenly. Thanks much.

[@fencingperson]

Thank you, Hank, for further dilating the plot hole in MI3

[@nohaahmed7645]

Thank you, it's my first time to understand AV node

[@LeTenaiix]

I've never seen McDreamy use a difibrilator... possibly in season 4, but he's a nero surgeon, not a cardiothoracic surgeon :P

[@aperson22222]

It sounds like the pacemaker cells' activity is extremely constant, fibrillation notwithstanding. But what controls the normal and perfectly healthy fluctuations in heart rate that we see, for instance, between strenuous exercise and rest?

[@chrissnow8592]

aperson22222 Autonomic nervous system will speed up and slow down the heart via the sympathetic and parasympathetic nervous systems

[@Greg41982]

aperson22222 Pacemaker cells actually have very organized activity that can depolarize automatically based on their membrane potentials. There are various calcium, sodium, and potassium channels that help maintain the gradients. As Chris Snow said, the rates can be modified by the parasympathetic and sympathetic nervous systems. For example: adrenaline increases conductance of sodium and potassium across the membrane thus increasing the slopes of the various phases of depolarization and leading to a faster heart rate. This is really a cool area to study.

[@aperson22222]

Greg41982 Thanks, that's very helpful. That was the level of detail I was hoping for.

[@nastehabdi1800]

aperson22222 à

[@dngmrls]

man, I never thought learning would be this fun

[@clarecornelius9068]

I HONESTLY LOVE YOU HANK

[@riqriq306]

You saved my life on the anatomy2 exam. Thank you Hank!

[@angelbrown3825]

I Love this guy😍 he save me once again

[@christinat9985]

These heart videos are NEARLY PERFECT!!!! I just wish that the right ventricle was visibly smaller than the left!! they both look equally strong, i might even say the right is just barely bigger than the left which is wrong, but yea no shade, I love crash course!