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.
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
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!!!
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.
"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.
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.
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
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!
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!
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.
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.
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.
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!
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!
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.
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!
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.
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
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! :)
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!
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!
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!
Hey can anyone help me, what are the structural changes of the heart due to congestive heart failure? and why would this be beneficial in the care of heart failure (why is it beneficial to compensate for reduced blood pressure?)
Thank You !! I havé One question, how do the "leaky" pacemaker cells regenerate their potentials? Like the ions will flow by gradient until there's no more potential. Is it NAK ATPase like other cells??? Thank you!
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!
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.
***** How do they do that tho. What are the *physical mechanisms* that these hormones effect which increases the frequency of action potentials? I mean, the cells trigger their own action potentials, that's weird. It's like it's bypassing all the normal neuronal control systems.
It's easy. When we're physically active we use the energy our body produces allowing us to jump around and run for example, and to get this energy we need our heart, our heart is a massive pump pumping out oxygen and other things to produce energy, we use that energy when we're physically active. When we run for example we need more energy in order to keep on running so our cells send out signals saying we need more energy, resulting the heart to go faster to maintain the cells craving for new energy. English is my third language so don't be hard on me if I use the wrong grammar and stuff. I could explain it much better in my own language... And I don't think I need to get deeper, hope this answers your questions.
okay heres another explaining with much more depth. the brain and other parts of your body send signals to stimulate your heart to beat either at a fast or a slow pace depending on what you do. all the chemical signals interact to affect your heart, the net result is that these signals tell the SA node (which hank showed you is at the top of the heart and that signal follow a line in your heart conecting to the a node and the heart contracts. When the body requires more oxygen to function, signals from your body causes your heart rate to increase significantly to deliver more blood (and therefore more oxygen) to the body. Your heart rate can increase beyond 100 beats per minute to meet your body's increased needs during physical excercise. and same goes for wnen youre resting you cells send singnals to the heart to beat slower cause you dont need more energy. if this dosnet answear a part of your question then go online and search it up. im a med student and yes i could really go in further but do i really need to do that?
The sympathetic and parasympathetic nervous systems are ``forces`` that affect your heart rate. Both systems are made up of very tiny nerves that travel from the brain or spinal ( the thing that go through in the middle of your heart as i explained in the comment before) cord to your heart. The sympathetic nervous system is triggered during stress or a need for increased cardiac output and sends signals to your heart to increase its rate. The parasympathetic system is active during periods of rest and sends signals to your heart to decrease its rate.
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?
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.
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.
So you are telling me that to fix a heart I need to turn it off and on again?
Yashendra Shukla And clear the cache.
LMAOOO this needs more thumbs up
sir, you win. truly.
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
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.
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
What school do you go to where you spend an entire month on cardiac conductivity in this depth...
we barely spent a week on it and im in highschool
Clare Cornelius well said i agree
You obviously aren't a genius either, can't even spell youtuber
aaaaaand the buzzkill arrives. Typical of youtube comments
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!!!
You realize that Hank just summarizes and presents information right? Like he doesn't know this stuff
@@ObjectiveZoomer I think everyone here knows that he has a team behind him but remember that the Green Brothers created Crash Course.
I’m in A&P 2 online right now and this is a life saver! I’m also taking this class for Nursing school!!
Omg congrats !! I’m trying to get into nursing but hopefully I’ll get accepted this year I’m currently taking A&P 2
Dallas G you’ll get it, were all routing for you!!
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.
+Y2KNW Well done! Doing CPR is extremely hard work!!!
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.
RIP
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.
@@shadowsweetheart7188 in Indonesia it's 30 mins because of ethical issues
i came here to have a good time and then the mcdreamy thing hit me like a truck
get it
i cry
Yep :(
Gabrielle - to me it was a spoiler so i'm crying extra 😭😭😭
At least it wasn’t a bus
Too soon 😭
He DIES LIKE THAT!?
As a Tuba player I know that the trumpets are the first people off beat and the triangle never was on beat.
I LITERALLY Laughed out loud, why doesn't this have more likes!?!?!?!?!?!?!?!?!?!?!?!
It’s cuz all of the trumpet and percussion players downvoted this
What about cornet and horn players?
believe me, its a lot trickier to come in on time if you're playing more than just 120 bars of low crotchets
"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.
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.
I loved 1:09!
"I'm here to help your head understand your heart."
RIP McDreamy
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
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 😂
that drunk voice dou XD
how to put ob speed .5
He doesn't talk fast people just listen slow, lol
Fox Hunter i just like his drunk voice LMAO
or watch in 1.5 for a while then put it back to normal, vwala, sounds like hes talking normal speed
Yooooo, this new kendrick is 🔥🔥🔥
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!
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!
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.
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.
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.
Thank your for elaborating 👌🏾
So what do you do if it's non-shockable??
Excellent orchestra metaphor!
Hank saving my life with midterms. Learning a whole chapter in 9.5 minutes when my professor spends 3+ hours explaining it LOL
That wasn't a terrible joke! It made me laugh , and it makes sense lol.
Raki B
Exactly
This is a hearty load of information.
Good joke
That was probably the most fascinating thing I've ever watched on youtube. Thank you.
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!
“And McDreamy... may he rest in peace” 😂😂
"And when McDreamy (may he rest in peace), finally bursts open those paddles" LOL love the GA reference
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!
These videos are getting me through my first weeks of med school! Thank you so much CrachCourse :)
I don't even watch Grey's Anatomy but come on! Spoilers, man!
you literally made my day! :D
Right!?!?
Loool! I feel your pain 100% 😂
7:17 Pretty sure we're gonna see some hilarious bloopers for that one!
***** I certainly hope so, especially an animated one!
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!
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.
i can watch these all day if i had the time :)
You remind me of Doctor Who. Thanks for your vids, they saved my life for AP test.
60 page chapter broken down in 9mins.... I thank you hank!!!
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!
This is probably one of the most helpful videos I have ever seen. Thank you so much for breaking everything down.
Hank, you're a legend!!!! Seriously so grateful for your teachings
Chanceless lectures! Means a lot since it gets everyone out f sleepless nights and sorts out confusions within no secs!
hank
you are the not the hero we deserved but the hero we needed
Complete heart in 9.33 minutes!! Super awesome!
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.
I am very grateful for this channel
OMG HE TALKED ABOUT GREY’S ANATOMY I FRICKING LOVE YOU ♥️♥️♥️♥️♥️
This is definitely a good refresher for my EMT exam that's slowly coming up.
lol thanks for the spoiler! I'm still on season 10 :(
im so pissed me too
AHHHHHHHHHHHHHHHHHH
SO NOT OKAY :,(
I'm on season 2. Ugh.
im on season 6 :(
That orchestra analogy was just... wow. Thank you
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
You make everything click, clack and snap into place!!!!!! THANK YOU!!!!!
Thank you so much Hank! Your videos are helping me with my intro to human anatomy and physiology class during this quarantine.
So many greys anatomy references.. im already a fan of this cc series too!!
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! :)
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!
Haha it is fun to imagine that you're a wizard or something! Yeah, I did appreciate that! :)
same
It's a gay little wand
These pictured videos are everything. Thank you so much
crash course is just....AMAZING....
Gosh I love these videos so much
You are a LIFE SAVER in the midst of my university being online due to the virus!!
I HONESTLY LOVE YOU HANK
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!
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
OMG YASSS DC'MCDREAMY AND GREY!!!
Thank you, it's my first time to understand AV node
The Fact that Hank just used Greys Anatomy references, practically just made my life.
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!
Thanks for breaking that down.
hank, you deserve a medal.
The heart is definitely one of my favorite organs.
Cardiophiles are gonna loooove this series
Thanks for crash course, you guys are ace!
You saved my life on the anatomy2 exam. Thank you Hank!
First you had my curiosity...but now that Dr. McDreamy is involved you have my attention 😍 😄
someone give this man a prize
Hey can anyone help me, what are the structural changes of the heart due to congestive heart failure?
and
why would this be beneficial in the care of heart failure (why is it beneficial to compensate for reduced blood pressure?)
there is nothing better then crash course!!!!!!!!
Closed my EMT text book and typed in “crash course physiology” oh thank God for Hank and the graphics team.
completely unrelated to the content of this video --which is awesome, btw! Learned a lot-- I love your strong mad on the table!
I may not absorb it all, but I always learn something from these videos!
Can't thank you enough for this video! It has made my uni assignment so much easier because now it makes sense!
These videos are helping me pass my course!! LOVE THEM SO MUCH!!
I love how in chemistry you look so dead lol but in AnP you look so alive haha. Me tooo!!!!
Hank, you must like watching Grey's Anatomy. You are certainly up to date as what's happening in the show. Love your work!
I wish you had went more into the explaining the If channels, T type calcium channels but great job
The Grey's anatomy reference 😭😭💕
You deserve my tuition my friend
he is just the best teacher :O
That RIP McDreamy was uncalled for 😭
Another awesome video! Keep up the great work, Hank!
man, I never thought learning would be this fun
YOU SAVED MY GRADE
Thank You !! I havé One question, how do the "leaky" pacemaker cells regenerate their potentials? Like the ions will flow by gradient until there's no more potential. Is it NAK ATPase like other cells??? Thank you!
This is so helpful. Thank you for making this easy to understand! I feel more confident about my test tomorrow.
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!
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.
Thank you for this finally understand this fully
love the links at the end for reviewing great idea!
So why does the heart speed up when we're physically active? What signals are triggering the action potentials to cycle faster?
***** How do they do that tho. What are the *physical mechanisms* that these hormones effect which increases the frequency of action potentials?
I mean, the cells trigger their own action potentials, that's weird. It's like it's bypassing all the normal neuronal control systems.
It's easy. When we're physically active we use the energy our body produces allowing us to jump around and run for example, and to get this energy we need our heart, our heart is a massive pump pumping out oxygen and other things to produce energy, we use that energy when we're physically active. When we run for example we need more energy in order to keep on running so our cells send out signals saying we need more energy, resulting the heart to go faster to maintain the cells craving for new energy.
English is my third language so don't be hard on me if I use the wrong grammar and stuff. I could explain it much better in my own language... And I don't think I need to get deeper, hope this answers your questions.
okay heres another explaining with much more depth. the brain and other parts of your body send signals to stimulate your heart to beat either at a fast or a slow pace depending on what you do. all the chemical signals interact to affect your heart, the net result is that these signals tell the SA node (which hank showed you is at the top of the heart and that signal follow a line in your heart conecting to the a node and the heart contracts. When the body requires more oxygen to function, signals from your body causes your heart rate to increase significantly to deliver more blood (and therefore more oxygen) to the body. Your heart rate can increase beyond 100 beats per minute to meet your body's increased needs during physical excercise. and same goes for wnen youre resting you cells send singnals to the heart to beat slower cause you dont need more energy.
if this dosnet answear a part of your question then go online and search it up. im a med student and yes i could really go in further but do i really need to do that?
***** Sympathetic and parasympathetic nervous systems yes but that dosent answear the question either...
The sympathetic and parasympathetic nervous systems are ``forces`` that affect your heart rate. Both systems are made up of very tiny nerves that travel from the brain or spinal ( the thing that go through in the middle of your heart as i explained in the comment before) cord to your heart. The sympathetic nervous system is triggered during stress or a need for increased cardiac output and sends signals to your heart to increase its rate. The parasympathetic system is active during periods of rest and sends signals to your heart to decrease its rate.
I JUST STARTED WATCHING GREY'S ANATOMY I KNOW I'M ALREADY WAAAAY BEHIND BUT HANK Y U DO DIS?!?!!!
the animation makes it look like the chordae tendinae pull the valves open instead of pulling them shut
In what part of Heart are you going to get to Ann and Nancy Wilson? :)
Keep up the superb work.
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?
aperson22222 Autonomic nervous system will speed up and slow down the heart via the sympathetic and parasympathetic nervous systems
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.
Greg41982
Thanks, that's very helpful. That was the level of detail I was hoping for.
aperson22222 à
made it so much easier to understand
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.