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!!!
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.
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.
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.
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 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!
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
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!
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'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.
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!
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!
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!
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.
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.
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!
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?)
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.
***** 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.
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.
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
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!!
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.
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
"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.
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
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!?
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."
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!
Yooooo, this new kendrick is 🔥🔥🔥
Hank saving my life with midterms. Learning a whole chapter in 9.5 minutes when my professor spends 3+ hours explaining it LOL
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
RIP McDreamy
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!
Excellent orchestra metaphor!
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% 😂
"And when McDreamy (may he rest in peace), finally bursts open those paddles" LOL love the GA reference
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??
“And McDreamy... may he rest in peace” 😂😂
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
i can watch these all day if i had the time :)
The Fact that Hank just used Greys Anatomy references, practically just made my life.
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.
7:17 Pretty sure we're gonna see some hilarious bloopers for that one!
***** I certainly hope so, especially an animated one!
That was probably the most fascinating thing I've ever watched on youtube. Thank you.
hank
you are the not the hero we deserved but the hero we needed
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!
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!
60 page chapter broken down in 9mins.... I thank you hank!!!
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
You remind me of Doctor Who. Thanks for your vids, they saved my life for AP test.
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!
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'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.
These videos are getting me through my first weeks of med school! Thank you so much CrachCourse :)
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 :(
ok, part two is the heart because if you can't not breathe in and out the membrane.💜💜💜💜💜💜💜💜💜💓💓💓💓💓💓
Chanceless lectures! Means a lot since it gets everyone out f sleepless nights and sorts out confusions within no secs!
hank, you deserve a medal.
So many greys anatomy references.. im already a fan of this cc series too!!
Gosh I love these videos so much
I am very grateful for this channel
Complete heart in 9.33 minutes!! Super awesome!
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!
OMG HE TALKED ABOUT GREY’S ANATOMY I FRICKING LOVE YOU ♥️♥️♥️♥️♥️
The Grey's anatomy reference 😭😭💕
This is probably one of the most helpful videos I have ever seen. Thank you so much for breaking everything down.
Cardiophiles are gonna loooove this series
Closed my EMT text book and typed in “crash course physiology” oh thank God for Hank and the graphics team.
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!
yall gotta put in soiler alerts im curently crying over george you cant tell me derek dies too
These pictured videos are everything. Thank you so much
Hank, you're a legend!!!! Seriously so grateful for your teachings
That orchestra analogy was just... wow. Thank you
crash course is just....AMAZING....
I HONESTLY LOVE YOU HANK
someone give this man a prize
You are a LIFE SAVER in the midst of my university being online due to the virus!!
The heart is definitely one of my favorite organs.
OMG YASSS DC'MCDREAMY AND GREY!!!
Thanks for breaking that down.
Thanks for crash course, you guys are ace!
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!
You make everything click, clack and snap into place!!!!!! THANK YOU!!!!!
Spoiler alert!!! McDreamy! I haven't watched a moment of Grey's Anatomy, but now I know what to expect if I should ever start watching it. Ha-ha!
there is nothing better then crash course!!!!!!!!
he knows alot about the body parts
Thank you, it's my first time to understand AV node
Now if only somebody could explain why game designers think defibrillators are a general cure for death.
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.
he is just the best teacher :O
Wow this helped me so much !!!
This is definitely a good refresher for my EMT exam that's slowly coming up.
That RIP McDreamy was uncalled for 😭
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
Thank you for this finally understand this fully
completely unrelated to the content of this video --which is awesome, btw! Learned a lot-- I love your strong mad on the table!
You deserve my tuition my friend
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!
YOU SAVED MY GRADE
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
love the links at the end for reviewing great idea!
I JUST STARTED WATCHING GREY'S ANATOMY I KNOW I'M ALREADY WAAAAY BEHIND BUT HANK Y U DO DIS?!?!!!
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?)
Hank, you must like watching Grey's Anatomy. You are certainly up to date as what's happening in the show. Love your work!
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.
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.
In what part of Heart are you going to get to Ann and Nancy Wilson? :)
Keep up the superb work.
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.
4:23
If the ion channels of the pacemaker cells are always open, how can re-polarization occur?
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 saved my life.
Thank you so much Hank! Your videos are helping me with my intro to human anatomy and physiology class during this quarantine.
I love how in chemistry you look so dead lol but in AnP you look so alive haha. Me tooo!!!!
I Love this guy😍 he save me once again
man, I never thought learning would be this fun
I cracked up at the DON'T YOU DIE ON ME thing