The Cardiac Cycle, Animation

[@Alilamedicalmedia]

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[@CarolineBay]

4 minutes taught me what a 1 hour lecture couldn't... thank you!

[@in-6012]

Lol

[@pubgliteshortvideos6095]

Really

[@YasirKhan-jo7rd]

Really lol

[@sofiaguerrero0969]

Lmao ikr

[@murphyriddle5005]

But I still don't understand

[@kalelm2943]

The cardiac cycle refers to the sequence of events that occur and repeat with every heart beat. It can be divided into 2 major phases, Systole and Diastole. Each of which subdivides into several smaller phases. Systole and diastole refer to ventricular contraction and relaxation respectively. Reminders: - blood flows from higher to lower pressure - contraction increases the pressure within the chamber while relaxation lowers the pressure - Av valves open when atrial pressure are hogher than ventricular pressure and close when the pressure gradient is reversed - Similarly semilunar valves open when ventricular presures are higher than aortic pulmonary pressures and close when the reverse is true. Phase 1 atrial depo/contraction Phase 2 iso. Contrction Phase 3 rapid ejection Phase 4 reduced ejection Phase 5 iso. Relaxation Phase 6 ventricular filling The cycle is initiated when the firing of the SA node that stimulates the atria to depolarize. This is represented by the P wave in the ECG. Atrial contraction starts shortly after the P wave begins and causes the pressure within the atria to increase forcing blood into the ventricles. Atrial contraction however only accounts for a fraction of ventricular filling because at this point the ventricles are already almost full due to passive blood flow down the ventricles thru the open av valves. As atrial contraction completes, atrial pressure begins to fall reversing the pressure gradient across the av valves causing them to close. The closing if the av valves produces the first heart sound S1 and marks the beginning of systole. At this point, ventricular depolarization represented by rhe QRS complex is halfway thru and the ventricles contract rapidly building up pressures inside the ventricles. For a moment however the semilunar valves remain closed and the ventricles contract within a closed space. This phase is refered to ISOVOLUMETRIC CONTRACTION because no blood is ejected and ventriclular volume is unchanged. Ventricular EJECTION starts when ventricular pressure exceed the pressure within the aorta and pulmonary artery. The aortic and pulmonic valves open and blood is ejected out of the ventricles. This is the RAPID EJECTION PHASE. As ventricular REPOLARIZATION reflected by the T wave begins, ventricular pressure starts to fall and the force of ejection is reduced. When ventricular pressure drop below aortic and pulmonary pressures, the semilunar valves closed marking the ends of systole and beginning of diastole. Closure of semilunar valves produces the second heart sound S2. The first part of diastole is again isovolumetric relaxation as the ventricles relax with all the valves closed, ventricular pressure drops rapidly but their volumes remains unchanged. Meanwhile the atrium being filled with blood atrial pressure rise slowly, ventricular filling starts when ventricular pressure drops below atrial pressures causing av valves to open allowing blood to flow down the ventricles passively. The atrial contract to finish the filling phase and the cycle repeats itself.

[@mrk.8448]

thank you

[@taibaliaqat9560]

THANK YOU FOR THIS!

[@zixianooi7321]

thanks for thisssssss!!!!!!!!!!!

[@khasifpratama2303]

THANK YOU SM!!!

[@vanessaalbacite4599]

Really appreciated this summary

[@ericlewis6404]

If you're searching for videos that explain the CARDIAC CYCLE - STOP! LOOK NO FURTHER! This is THE BEST VIDEO on KZbin. Thank you!!!!!

[@moformedicine1260]

As a medical student, this took me a while to understand. But after practice and time and time of coming back to this video I would have to say this is the BEST video out there on the cardiac cycle, EKG, systole, diastole etc. It's 100% spot on.

[@EvsPersonal]

This video just compiled an entire 100+ slides, 6 individual 10+ min videos, into a 5min animation. ANIMATIONS ARE SO UNDERRATED. you need to see the animation paired up next to a graph in order to grasp and apply the full concept of the Cardiac cycle. I've been looking for a video like this.

[@ilaydamahmutoglu5942]

same here 👍

[@beatricecajetan2632]

ABSOLUTELY! AS AN AUDIO-VISUAL LEARNER, THIS IS DEFS AN EXTREMELY HELPFUL TECHNIQUE

[@nneoma830]

Where are the animations?

[@isabela6967]

THIS IS SUCH A LIFE SAVER. THANK YOU. alot of the videos dumb down the explanations and dont give you how they relate to the ecg recordings

[@rarazxra]

love it.

[@zmmnsaleh]

one second takes months to understand

[@gianluca0castell]

u got to think multilayer ,as of the electric chimical and mechanical events,then moving on a time lime everything becomes clearer

[@multikimberification]

poetic way to look at. Likey.

[@armin2621]

takes months to understand, yet you have to do it in one week XP

[@ujjwalprakash3170]

0.8 sec more accurately😛

[@pigeonlove]

the 480,000 views were just the 6k thumbs up folk watching 80,000 times on repeat

[@abdallahhariri6798]

a non-understandable 90 mins lecture reduced into an amazing 4 mins video!!! god bless you, you help medical students around the whole world

[@khalidkingkhankhan6782]

Abdallah Hariri are you a medical student ? of which university

[@abdallahhariri6798]

@@khalidkingkhankhan6782 Yes I'm, Misr University For Sience And Technology (Egypt)

[@en_lune]

you literally changed my life in just 4 minutes i cannot thank you enough

[@shaun_rambaran]

Amazing! I never realised the sound of the heartbeat was actually the slamming shut of the valves. I always had assumed that somehow the muscle contractions made the sound directly.

[@filmonhaile3327]

Me too man 🤣

[@iceychaos1234]

This is incredible. Easily the shortest yet most comprehensive overview of the cardiac cycle I have found yet. Textbooks make it seem more convoluted than it actually is.

[@SatieSatie]

When a 4 min video in a foreign language (foreign because I'm studying this in German) explains it a 100 times better than expensive text books over an entire chapter...

[@hibaomair3160]

Lol, honestly, KZbin teaches better then books, sometimes, plus, its cost free.

[@germoney9998]

An welcher Uni bist du

[@C_Castillo]

For real tho lol

[@daniellarios9139]

For the past couple weeks I couldn't get anyone to successfully explaine systole and diastole.. within the first 20 seconds of this video I finally feel confident about the entire process! Thanks for filling in the gaps and sharing this. Great video!

[@deborahr113]

This is probably one of the best, most informative videos on human anatomy I have ever watched.

[@halliereeve3961]

Clearer than the two hours worth of lecture videos I had to watch to get this information! Thank you!

[@rosybala2223]

Best video ever. Kudos to creators. You saved millions of med students. Thank you.

[@vineetaggarwal9316]

One of the best videos I have came across

[@udprakash]

I, as a physiologist, found these medical education videos from Alila Medical Media very simple, informative and well explained in almost every clinical perspective.

[@rugvedpawar7114]

Thank you Mr. Prakash

[@afifanaeem4425]

The way presentation the so inspiring and understandable...made basics strong...and unlike other videos proper events in a cyclic way are explained...it's no less than a life saver

[@shreyasinha3279]

This vedio was worth watching.....I mean....entire thing in just 4 mins......That's what we need!!Loved it!

[@malihakhurshid9259]

Made wiggers diagram so easy. This video was the best one so far❤

[@doodoobearlove]

amazingly putting all the chart together at same time comparing with the heart on the side that really helps us to have a more complete pic of what's really going on at diff stages.

[@quotesandthoughts666]

This video deserves 10M views! 💓 Precise! On spot! Perfect!

[@Hussein_Ruqayah]

Woooowwww,best explain in world's about the "Cardiac cycle"😍😌😔... Greetings from a medical student in Iraq🇮🇶😍💪🏽

[@kamranyahyaabadi9399]

This video is presented awesomely thank u , though lets remember that there is also a " Dicrotic Notch " seen in the aortic pressure right in there while the pressure in the ventricles is falling as they relax , and this notch is there because once the aortic valve closes ( to prevent backflow ) some of this blood that wants to flow back into the ventricles from the aorta , bumps into the closed aortic valve and bounces back .

[@thanurirajapakshe3455]

Thank you so much, A clear explaination. 4 minutes video for 1 hour lesson taught me perfectly

[@CourtPolly]

For those of you reading this comment, it's okay, it's normal to feel lonely sometimes, if you're going through tough times, keep trying, but never give up,

[@ieashaconteh5433]

Thanks, this means a lot

[@estebanpaez2549]

Thank you I hope everything is going well for you 🙏

[@maad.huuuuu]

Thanks bro 🥺

[@tharubaskaran]

Give this channel a award just for this video!✨

[@DestinyIyobor-c1t]

Thank you for all your medical videos it has been very helpful instead of reading a 27 pages of a Text book 4 mins has done it all Thank you once again ❤❤❤

[@jourdanhamme4065]

This is incredible Thank you You just simplified the Wiggers Diagram

[@doricevalery7416]

Thank you for summarizing a 6 hour lecture ❤❤

[@dimplegupta864]

Amazing..!! Excellently explained in shortest time possible Thanx😊

[@obenoda8191]

You were so explicit and accurate Especially at the valves Thank you Big 👍🏽

[@kennystallcup435]

I remember watching thia video in the past years just to know the phases of the heart cycle. i returned once again to see how its denoted on the EKG. just to say its lovely how so much information and diversity is given in 1 Video

[@vaibhavjain3234]

This channel is GOLD!!

[@arenaofbiology9832]

Thank youuu sooooo much dear.. yesterday I have planned to refuse this topic..bcz it's very hard to understand.i didn't understand anything from this complex cycle.. now i am ok with this. Thank you

[@serendipity_6179]

Thank you so much. This helped me more than any lecture or textbook

[@dr.fakhar-ul-islam2297]

Fantastic approach. Highly appreciable.

[@iceasneeded]

Thank you! Seeing ALL of this at the same time helped me SO much!

[@babynewms]

THANK YOU!! months of half-understanding fixed in under 5 minutes.

[@justanotherhuman5162]

All I can say is God bless you ma'am!. Thank you

[@alvapu1966]

Thank you very much for your generosity in sharing this excellent material.

[@NouraFares_]

Excellent explanation. Thank you

[@sherinhsb]

Thank you for explaining it step by step. It's really helpful. I saw this diagram on books but haven't got any information out of it. But now I can see how useful this diagram is.

[@nicholeknight1893]

Thank you, I'm taking pathophysiology and needed a refresher ♥️

[@scott8908]

Currently a Paramedic going through ADN school to become an RN. Cardiology is a weak point for me but this video helps a ton. Thanks

[@ghassanauf8103]

your videos are the best and are better than thousand lectures

[@A.Versatile.Girl.]

At first i studied from my textbook.. Than... Watched almost 7 to 8 videos of so long durations... But these 4 minutes changed my mind and my mood as i was so furious and was about to cry... ❤ thanks to this video for making my heartbeat normal once again 😍haaaaaaaahhhh

[@Olivia-tb9kk]

This is soooooo helpful before exams tomorrow, thank you!

[@jaycilangehennig2059]

Thank you! From a Music Ed major that has to take Life Science to graduate. Science is like learning French for me 😩 but this really helped! 😃❤

[@موسىلطفالحمري]

Hallo

[@thajasnethomas778]

Thank you so much... this has made my fundamentals very strong. Once again, really appreciated!

[@irisarucan2797]

I'm glad I clicked this video FIRST. Helped me a lot!

[@indulekshmi4320]

Watching for my neet mds.... U are really amazing

[@Dr.Kamran97]

liked subscribed and shared this video because this is the least i can do to show my gratitude. thank you for saving the day of us all.

[@vishuudongre1172]

Ohh girl uhh explained each thing reallyyyy clearly thank you so much all concepts are visual now❤️ love from INDIA❤️

[@robertabristotsilvestrin3601]

Thank you so much for helping me teach human physiology to my students!

[@courtneyd6946]

VERY good video with visual explanations!

[@laraibnadeem125]

I was stuck in this topic for an hour and you taught me that in minutes..... thank you so much...!!!

[@christycrysalide3656]

Thank you SO MUCH ! I have my final exams soon and i had troubles to understand this part so THIS IS AMAZING ! THANKS ! 😍

[@alonator09]

THANK YOU sincerely, stressed out dental student :')

[@abhinavadvani3996]

Me too By the why which country u are from

[@abdulazizaljohani4611]

Same here sis ):

[@panicpalette]

Alexandria Talley same.

[@muhammadosamaelsayedbaioum6110]

Same here guys :")

[@mashagrey]

saaaame :D

[@ThanalopPK]

This Cardiology playlist is awesome! Thank you

[@pj16904]

I rarely write comments, but this 4 minute video made me do it! So good!😀❤

[@anna_aka_epicinternetgf]

Excellently explained! And the visuals are so easy to follow! Great job

[@mckenzilewis7554]

These videos are absolutely AMAZING

[@magdalenobrayan]

i just spent like 5 hours figuring this out when i could've just watched this video, fml in addition i kept getting confused when i would see AV valve(s) and think they were referring to the aortic semilunar valve and was about to cry

[@mickeyromero9233]

Thank you for your KZbin services

[@viennajune2267]

I'm 14, taking gifted bio classes. this helped me a lot because I didn't understand anything in class. very clearly explained

[@erzas556]

I don’t know how to thank you, very well explanation with the heart picture and animation of the cycle with the ECG diagram! Thank you sooooo much

[@Efootball-YTLegends]

Best video on cardiac cycle ever by a distance

[@aleenahmohsin1060]

Probably the best explanation of cardiac cycle on internet so faar!

[@glengeorge5888]

That graph is the bane of my existence

[@DevelopArmed]

best cardiac cycle video in the internet

[@LucasSilva-kv3km]

Why is this so hard to learn? 😭😭😭

[@karanchoudhary4222]

Its easy if u r not a kid

[@sujatamuddu4109]

Karan Choudhary did u understand

[@whisperingsage]

Because there are so many steps and many details that are broken into smaller steps.

[@whisperingsage]

But memory is improved with fish oil or krill oil, magnesium, niacin (no flush) and vitamin D. I found I didn't need to repeat as much when I was on my brain supplements.

[@zunioe]

whisperingsage how do you take these supplements on a daily basis?

[@roberttucker1527]

One if the finest videos on the subject

[@birch3607]

This was so beautifully explained! Thank you!

[@ranjanachauhan92]

Very good explanation...we couldn't understand it even in our 1 hrs class lecture ❤️❤️

[@makindegloria9857]

God bless you, I've been searching for this for a while now..😘😘😘

[@119alias]

Best channel for medical videos ! Please keep going!

[@devanshitalati134]

Omg thank you so much Perfectly explained in just 4 minutes

[@xuhan3781]

This is wonderful!!! Thank you for all your great videos!!!

[@bitaswift6537]

That was awesome! I really appreciate what you do because it really helps me to understand

[@trending6802]

Thank you, very helpful ❤️❤️

[@abdulazizusman2725]

Really wonderful video. I watched many videos about cardiac cycle but not one was able to illustrate it in a comprehensive way like this video. You've earned my subscription and like 👍

[@lkw5699]

Articulate and explained slowly. Excellent graphics

[@hangman2869]

really good video, very condensed but otherwise accurate and easy to understand

[@WhimsicalMED]

i actually used a stopwatch to see,what time a cycle required and it actually took 0.8 sec ,the time our heart takes.Seriously nice easter egg @alilamedicalMedia

[@Alilamedicalmedia]

:) glad you noticed, we always try to be as accurate as possible :)

[@BushraHassan-yv1sp]

Best way of teaching

[@anshumehta8222]

Best video to understand cardiac cycle with all details and important points Thanks a lot

[@YouCanDoX]

WOW amazing video. You saved me from going crazy on cardiac physiology

[@snip-sniptear956]

Any student here taking a Physiology course and learning Chapter 13 of The Heart? The lecture with slides and photos is not enough. This puts everything in less than 5 minutes from a 4 hour lecture.

[@ess9599]

This video is going to be the video that makes me pass my exam

[@Alhamdulillah-557]

Thanku so much it help me so much I learned quickly from here and today is my final exam:)

[@hg8301]

wow how wonderfully explaind! i really appreciate this video!

[@Josey168]

This was so incredibly helpful!

[@aboodyghost2155]

Every second is important in this video!

[@a.d.6601]

Cardiac Cycle Breakdown: Cardiac Cycle Definition: The sequence of events that occur and repeat with every heartbeat. Major Phases: Divided into two major phases - Systole and Diastole. Systole: Ventricular contraction. Diastole: Ventricular relaxation. General Principles: Blood flows from higher to lower pressure. Contraction increases pressure within a chamber. Relaxation lowers pressure. AV (TRICUSPID/BICUSPID) valves open when atrial pressures are higher ventricular pressures. They close when the pressure gradient is reversed. Semilunar valves open when ventricular pressures are higher than aortic/pulmonary pressures. Initiation of the Cycle: SA node firing stimulates atrial depolarization (P-wave on ECG). Atrial contraction increases atrial pressure, forcing blood into the ventricles. Atrial Contraction: Atrial contraction contributes a portion to ventricular filling. Ventricles are already almost full due to passive blood flow through open AV valves. AV Valve Closure: Atrial pressure falls, reversing the pressure gradient across AV valves. AV valve closure produces the first heart sound, S1, marking the start of systole. Isovolumetric Contraction: Ventricles contract, building pressure inside but semilunar valves remain closed. No blood is ejected, ventricular volume is unchanged. Ventricular Ejection: Ventricular pressures exceed aortic and pulmonary artery pressures. Aortic and pulmonic valves open. Blood is ejected from the ventricles. Rapid ejection phase. Systole Completion: Ventricular repolarization (T-wave) begins. Ventricular pressure falls. Semilunar valves close, marking the end of systole (S2). Diastole (Part 1): Isovolumetric relaxation as ventricles relax with all valves closed. Ventricular pressure drops rapidly, volumes remain unchanged. Ventricular Filling: Atria are filled with blood, atrial pressures rise slowly. AV valve opens (blood flows passively into ventricles). Atria contract to finish filling phase. Cycle Repeats: The cardiac cycle repeats itself. Important Vocabulary: Systole: The phase of the cardiac cycle when the heart contracts (ventricular contraction). Diastole: The phase of the cardiac cycle when the heart relaxes (ventricular relaxation). AV Valves: Atrioventricular valves (tricuspid and bicuspid/mitral valves) that regulate blood flow between atria and ventricles. Semilunar Valves: Valves (aortic and pulmonic) that regulate blood flow from ventricles to the aorta and pulmonary artery. ECG: Electrocardiogram, a test that records the electrical activity of the heart. S1: The first heart sound, produced by the closure of AV valves at the beginning of systole. S2: The second heart sound, produced by the closure of semilunar valves at the end of systole. Isovolumetric Contraction: A phase of systole when the ventricles contract with all valves closed, resulting in no blood ejection. Ventricular Ejection: The phase of systole when blood is ejected from the ventricles into the aorta and pulmonary artery. Ventricular Filling: The phase of diastole when the ventricles fill with blood from the atria. SA Node: Sinoatrial node, the natural pacemaker of the heart that initiates the cardiac cycle.

[@pratikshashinde6870]

Brilliant explanation!

[@haifaaferas8311]

I'm watching this for my A levels and I wish anyone told us about it before.. Amazing video

[@tasneemfahoum5931]

great simplified explanation. Thank you!!