Cardiovascular | Cardiac Cycle

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Official Ninja Nerd Website: ninjanerd.org
Ninja Nerds!
Join Professor Zach Murphy in this lecture where we discuss the cardiac cycle along with clinical correlates that can occur. We hope you enjoy this lecture and be sure to check out all of our social media pages and ways to support us below!
References:
● Le T, Bhushan V, Sochat M, Chavda Y, Zureick A. First Aid for the USMLE Step 1 2018. New York, NY: McGraw-Hill Medical; 2017
● Mancini MC. Heart Anatomy. In: Berger S Heart Anatomy. New York, NY: WebMD.emedicine.meds....
● Hill M. Cardiovascular System - Heart Histology. embryology.med....
● Standring S. Gray's Anatomy: The Anatomical Basis of Clinical Practice. Elsevier Health Sciences; 2016
● Leslie P. Gartner, James L. Hiatt. Color Textbook of Histology. New York (NY): Grune & Stratton Inc.; 2006
● Maceira AM, Prasad SK, Khan M, Pennell DJ. Reference right ventricular systolic and diastolic function normalized to age, gender and body surface area from steady-state free precession cardiovascular magnetic resonance. Eur Heart J .2006; 27(23): p.2879-88. doi: 10.1093/eurheartj/ehl336.
● Marieb EN, Hoehn K. Anatomy & Physiology. Hoboken, NJ: Pearson; 2020.
● Boron WF, Boulpaep EL. Medical Physiology.; 2017.
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Опубликовано:

7 окт 2024

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Комментарии : 582

@yasminali7578 6 лет назад

it's honestly amazing when you find someone who actually cares about what they are explaining. I always used to wish I had someone to explain it to me like this.... then I found your channel. A comment section isnt enough to express how much i appreciate your videos...... please continue to explain these concepts with the care that you do

@NinjaNerdOfficial 6 лет назад

+Yasmin Ali thank you so much for your kind words they mean so much! I'm so happy we were able to help!

@sanaali2805 3 года назад

very true ...his flow makes concept easier

@wedneyanugwo7847 2 года назад

@RU-vid Account the aortic pressure is always greater than the ventricular pressure due it's total peripheral resistance which is dependent on the tone of the arterioles........ so what ever the preload (end diastolic volume)is....it still have to generate enough pressure through contraction to overcome the pressure in the aorter which is managed by the TPR....so if the arterioles are constricted the tpr Is more and then ventricles need to contract even more to overcome the pressure in the aorter..... And for the pulmonary pressure to be more than the right ventricular pressure there should be some kind of back pressure from the left ventricle which Is due to systolic or diastolic failure.....so I think that's the only way the pulmonary pressure pressure can be more than the right ventricle pressure.its too much to read but I hope I could help you a bit

@noahsamassa8974 2 года назад

Ala

@abeerchowdhury8510 Год назад

@@youtubeaccount7318 pressure = force / area. Pressure shares an inverse relationship with area. Smaller the area that the force is being applied upon the greater the pressure.

@mikepenalosa9589 2 года назад

You are the reason I can continue my career goals and make my family proud. You are also the reason why humanity will receive quality healthcare. Thank you.

@Williamwilliam1531 Год назад

I hope over the next 20 years, Medical professionals everywhere will be showering you with well-deserved donations. I hope people eventually realize - by measure of suffering alleviated, you are one of the most heroic and legendary creatures to ever grace the earth.

@Aressamarquez День назад

I'm an esthetician instructor and we touch on anatomy and physiology briefly and in a very simplified way. Though this was more sophisticated in what we need to know, this was perfect for me to understand. Thank you.

@naaengmann2117 3 года назад

What kind of teacher is this?? Why am I paying my school when i could be paying you. Sir, I must say you are an excellent excellent excellent teacher. I don't know what I would do without you and your wonderful videos. Thank youu soooo much

@dayennyd1062 5 лет назад

Things I've noticed. I learn so well with pictures and step-by-step explanation that this is sooooo much better than the power points we get in medical school. I feel like i learned so much!! Wish there was a wiggers integration with this but I can now look at one (using your EKG videos too) and get it regardless. THANK YOU THANK YOU! YOU'RE SO AWESOME!

@hariskhan-xj4wk 3 года назад

which med school u went

@ArundhotiRay Год назад

I do regret why I didn’t found this channel earlier. Thank you so much professor, for being such a wonderful teacher😊

@SoresaAbdisa-pc7ik Год назад

waw Amazing 😍

@sander_bouwhuis 4 года назад

You explain it EXTREMELY well/clearly! Especially the fact that you leave a tiny pause before you reveal the answers so that we as the viewers can come up with the answers ourselves. That is REALLY fantastic as it means we can actively participate instead of just passively view the material.

@sebcodestheweb9385 Год назад

Your teaching style is brilliant, I am impressed by how you manage to explain this topics so intuitively and easy without oversimplifying it and keeping it thorough.

@ASalfity 3 года назад

Brief Table of Contents: 0:10 - Cardiac Cycle Definition ( ~ .8 Seconds) 1:05 - Mid to Late Ventricular Diastole (diastole = relaxation) - (period of ventricular filling) - 5:20 - P Wave EKG 6:35 - Isovolumetric Contraction - 11:20 - “Lub” (S1) 12:05 - Mid to Late Ventricular Systole - (ventricular ejection) - 16:30 - QRS Complex EKG 16:50 - Isovolumetric Relaxation - 21:40 - “Dub” (S2) - 22:50 - T Wave EKG You may wish to add this to the description or create your own more detailed version. Thanks for these videos.

@mtwins2250 3 года назад

Wow thank you🙏🙏

@shubhamyadav7311 2 года назад

Thanks 🩺🧬🙏🙏🙏🙏🙏🙏

@lacatrass 3 месяца назад

@samanthastephens9443 Месяц назад

May your pillow always be cold and your belly full

@ElliePearl 5 лет назад

Teaching is an ART FORM! People assume that just anyone can do it, and it's not true. This video was excellent and so informative. It was an example of great teaching. I hope one day more attention will be brought to the importance of fine teachers and that they get paid more, because they truly make all the difference. I'm so grateful for this video. Thank you very much!

@amandawilliams6498 5 лет назад

I have had the hardest time understand the cardiac cycle in it's entirety. I watched your videos and you are great at explaining clearly, so those of us that "just don't get it, actually finally have our ah-ha moment". Thank you so much!

@jeanniechan6237 4 месяца назад

I have been reading my notes over and over again for an hour trying to understand nth but now I understand everything in 23 mins. Thanks so much for your teaching you save our lives!

@paulp8159 2 месяца назад

It is so much easier and clearer to learn watching Ninja Nerd lecture than watching a lecture in person and reading a textbook. I've watched about half a dozen videos on the cardiovascular and circulatory system today to supplement parts of the textbook I didn't quite understand. Thank you so much

@maheen97 3 года назад

God bless you - can't imagine doing medical school without you. You can explain things better in 20 minutes than professors can't do in hours!!!

@ChillNightDriveBeats 5 лет назад

I'm a medical assistant student and right now my school is going through a transition from one teacher to another. Unfortunately the new teacher is not working out well at all. You are so so helpful to me learning , I just had to express my many thanks to you and your videos. I'm learning everything I need to learn . I appreciate you!

@lu35253 2 года назад

I am brazilian! I am studying medicine in Paraguay and you are saving me in all posibles ways. I want to be a teacher and you are a such inspiration. Thank you is not enough. God bless you and your team.

@hannahsteff9472 3 года назад

Thank you so much for breaking this down and displaying it in such an easy to follow manner. Trying to learn this by just reading giant chunks of textbook was making my eyes crossed! So grateful for your channel-especially during online only learning.

@23hareemmalik76 2 года назад

Hi there. I know it's late. But just here to tell you how thankful we are for the channel. You have amazing way of explaining things. Keep blooming 💖

@MrFares123451 5 лет назад

This channel is better than my whole UNIVERSITY!!!! THANK YOU ❤ , and please don't stop making amazing videos like that

@kneelbeforedean8189 4 года назад

Yea it’s fun learning here, i hope when I enroll in any university I already know most of the things 😁

@zulalerdogan40 4 года назад

I'm a med student from Turkey. I watched your cranial nerves videos and they were very beneficial for my committee exam. Now I'm watching this 😃 You're very perfect in teaching 😁 Please keep going on for us 👏

@johnclark4476 4 года назад

You don’t need subscribers sometimes you need pray from medical students in terms like May God bless you with health,wealth,joy,laughter,prosperity and much more...

@richarddekoa7657 2 года назад

I'm not one to comment on YT videos but this video right here Sir has prompted me to do so. The explanation was clear and easy to understand LITERALLY!!! Mad love from a student in Fiji who is in Med school. Vinaka

@NinjaNerdOfficial 2 года назад

Welcome to the Ninja Nerd community! Check out the Discord (if you haven't already).. It's free and connects you with other community members from around the world to talk with/study with. - TG

@juliahildabrant7803 2 года назад

You have helped me understand more topics in both my anatomy and physiology 1 and 2 classes, than I can even explain!! It is clear you care about what you're teaching and you do it in a way that gives enough detail but also is simple enough to comprehend. Thank you so much!!!

@alexisteja9920 3 года назад

Wow! Thank you so much for this! You are very inspiring, Sir! Your passion for teaching translates on how much you want your students learn from you. This 23 minute video is a life saver. Thank you!!

@arnabbera.paints 4 года назад

I show my high school students these videos which are meant for medical students, and they understand it. That's how universal, in depth and clear your teaching is. ❤️❤️

@karlacasillas3596 5 лет назад

I thought I would NEVER understand this! I completely know this whole cycle by heart now thanks to you !!! Thank you for all yours videos.

@georgiamoncivais2330 Год назад

You are absolutely AMAZING with how well you thoroughly explained this entire process! Thank you so much.

@Dr-Hafsa12345 Год назад

you just cleared my all doubts , early ,i was very worried about my exam but then i found you video thank you doctor

@dylanchang5933 2 года назад

absolute genius. having knowledge is a feat, but explaining it to others is raw talent.

@eczed3984 2 года назад

I am a pharmacy student of Turkey. THIS ENERGY IS SO POWERFULL!!! I LIKE YOUR ENERGY. Thank you...

@hajerafirdous7513 7 месяцев назад

I must say yaarr you saved me 😭😭!!! Now I can finally prepare for my exams A big thankyou 😊

@kennethbutler9164 3 года назад

You’ve done it again my good man. You’re a master teacher. Thank you

@nkhomafrancis.7456 Год назад

Have been following these explanations since the day I start my studies and it's helping me a lot ❤

@chrischew770 3 года назад

You have a definite knack of explaining concepts. I am actually excited to sit down and watch your videos because I know I will be learning something and it will stick. A concept that I just could not understand fully for the past 4 years, was made perfectly clear in minutes of watching you explain the concept that has eluded me. Thank you kindly for making these valuable learning lessons.

@anorexshynervosa 5 лет назад

I'm gonna be a doctor because of you.

@choozomano977 4 года назад

Hello ninja nerd! I have been watching your videos for last 6,7 months. You are amazing. May God bless you with health, wealth, peace, prosperity and all. I don't have a job at this point of time. I'm preparing for an exam to get one & your videos are helping me a lot. Thanks a lot.

@kyla1602 2 года назад

This man is a national treasure.

@jessicaftw9564 3 года назад

I wanted to drop out of physiology when my teacher explained this lecture! But thank God I found this video! So easy to follow through and comprehend. Thank you 100x

@walewaluka4260 2 года назад

You're the best tutor I've ever had, all your topics are explained in the simplest manner.

@annachantalieva7510 3 года назад

Thank you so much! I survived AP I with great success thanks to you and hopefully AP II will be successful as well.

@ummenisa Год назад

Thank you very much Sir for making physiology much simpler for us. You’re better than most of our college professors Love from Pakistan 🇵🇰

@lifegoeson4904 Год назад

Hlo sir, I am a medical student who learn more on your video than in my classroom. ❤❤we support you always and we need more content like this.. ❤🎉

@joshm3519 5 лет назад

This is amazing stuff! This helps me so much going into Cardiac ICU and knowing the basic and fundamentals - awesome, thank you!!

@AliHaider-mj2dy 2 года назад

I is really helpfull , I have test tomorrow and this help me to recover and learn all the things.i read many books like guyton and hall and many other books and pdf but this vedio help me alot .thanks you sir for this great lecture

@Rosa-rc6me 4 года назад

I love the way you explained it, you made it sound so easy. appreciate people like you that take time for us to comprehend this material.

@Junior-su6bx 6 лет назад

THANK YOU SO MUCH! I was feeling really overwhelmed after our first exam and dove into all of the heart/Blood vessel information. Your videos are really well made and go hand in hand with the notes provided!

@bhagyaperera5672 2 года назад

Your videos are always the saviors of my university life. Thank you so much

@emineaydogdu7097 4 года назад

You are helping the students all around the world, making our lives easier. I would spend twice the time to understand the concept, yet still not have understood it well enough before I found your videos. I can spend the extra time with family and friends, also become content with my studies now! Greetings from Turkey :)

@dantuazon8567 Год назад

i couldnt quite figure this topic out for a very long time. 1 ninja nerd video later, and i can fully understand and picture it in my head..Thank you so much

@heavengarden4235 4 года назад

You are the best teacher 👨‍🏫 I have ever seen

@chickendeener 2 года назад

I think you used to tutor me in my local community college! I'm pursuing my master's at the moment and you are helping me again :) thanks for this video!

@shrutisingh6556 Год назад

One of the best teachers out there ! Thanks for ur hard work sir ! ✨✌️

@Mariam.Montaser 2 года назад

I have a cvs final in less than 3 days , this is life saving , thanks a lot! ^^

@NinjaNerdOfficial 2 года назад

Best of luck! - TG

@konstantinostheofilou1453 9 месяцев назад

this man is pure gold

@noellesimoes 6 лет назад

my professor could never

@charmainesayi4826 6 лет назад

joey :] same here😌😌😩😂😂

@k-addict8703 5 лет назад

Periodt 😂

@presleylamb7246 4 года назад

My professor pronounces it "diastol" and "systol" he also says semiluminum valves.... videos like this are my only hope.

@kneelbeforedean8189 4 года назад

Semiluminum valve 😂😂 lmao

@naturaltalent4975 4 года назад

@@presleylamb7246 🤣🤣🤣

@nattiemwale Год назад

You have really helped me with understanding I was just given a topic and that it will be present in my exams I was worried not until I've watched it Am even able to explain it to my friends Thank you very much

@user-tq7dt5vt4w 5 лет назад

I never comment on RU-vid videos but this is so great. Thank you so much for this gem!

@lipalomuyemba9414 5 месяцев назад

Honestly I have been using his channel for some time and this is my first time seeing him sooo young 😅

@dinaghulyan 5 лет назад

I can’t find appropriate words to describe how great your explanations are. They’re exceptional. AMAZING!!!

@rajashrees1546 2 года назад

you just make learning so easier that I don't even feel need to read those heavy books. It's so understandable here

@yeseniagarcia2302 2 года назад

I saw other videos before this one and you were the only one that explained it clearly. Thank you so much this video really is a life saver!!

@kentis1206 Год назад

I am an RN with 10 years of acute care experience in the hospital and I actually was just moved to tears at how easily I understood every single thing you were explaining in this lecture. My one great weakness has always been cardiac and understanding the mechanical logistics of what's going on during a cardiac cycle and in 20 minutes I understand more than I ever did in the entirety of my nursing school experience. I start NP school in January and you are my godsend. You are a gift to medical mankind. Thank you so much!!! I'll be spending all of grad school pouring through your hundreds of extremely helpful videos. YOU ARE AMAZING!!!!!!!!!! ❤

@pvratliff4 4 года назад

You are an Amazing Scientist and Instructor. Thanks for Everything!!

@narges8438 4 года назад

I cannot thank you enough for your effort and for making such an incredibly helpful videos 🙏 ❤️

@TheRhythmicRambler 2 года назад

My man, I'm an ICU nurse and you just made my life a lot easier

@piyushsumera1433 6 лет назад

I am baffled to know why this channel doesnt have that many subscribers and views on Videos likes these are very less..I guess people dont want to learn the things in details and want to just mug up the things after learning from short videos which other numerous channels have..But I guarantee Nobody can come close to this channel as far as Physiology is concerned.

@NinjaNerdOfficial 6 лет назад

+Piyush Sumera WOW!! This means so much thanks for the kind words!!!!

@tajosman6258 3 года назад

This didn't age well

@piyushsumera1433 3 года назад

@@tajosman6258 why??

@ASalfity 3 года назад

Yeah, I love the detail oriented nature of this channel. While I also watch other channels as well I come to this one for greater details. More details and more information is better, please, do not become like those other channels that just briefly summarize everything.

@abhilashpanigrahi6098 3 года назад

@@piyushsumera1433 cuz a lot more people are seeing this now

@subhashreepati1697 4 дня назад

Systole : 0.3 sec & 3 phases❤ *Isovolumetric Contraction *Rapid ejection *Reduced ejection Diastole : 0.5 sec & 5 phases ❤ *Protodiastole *Isovolumetric relaxation *Rapid filling *Reduced filling *Atrial systole/ Atrial depolarisation/Atrial contraction

@dhineshkr2844 3 года назад

Preparing for my exams...if i got passed definitely u will the first reason buddy..thanks a lot😊

@1987farri 5 лет назад

Your videos have helped me so much! I’m so glad I stumbled upon them! I understand everything so much more after watching your video! Thanks so much!

@gurla6467 4 года назад

I will never be capable of thanking you... You are the best teacher ever ❤️

@gearsofchristdevotionminis9462 Год назад

I now have my eyes open, thank you professor

@serellamadole 4 года назад

So happy that I found this video! You did a great explaining everything and helping me make that final connection that I was missing.

@Sam48025 4 года назад

OMG I understand! I've watched like 3 videos and this video was the most comprehensive to me and I can finally understand each step. I also liked the way you drew it out. Very easy to understand. Thank you so much :)

@nirvana5902 3 года назад

You have singlehandedly rescued me from getting dumped on by my finals tomorrow... Much love

@naaengmann2117 4 года назад

Wow.. the explanations are perfect. You are a superb tutor. Wow.. Just amazing!!!

@herdest1 5 лет назад

This guy right here! My hero, a great compliment to the books. THANK YOU SO much! You rock!

@JayWalk23 Год назад

Thank you, so easy to follow. No rushing, just great teaching 👏🏾👏🏾👏🏾

@raveenajaved8708 4 года назад

Ah! Bless you. You have made learning easy for us. So much respect for you!

@taherabuzaid142 3 года назад

dude, do u even understand how great the work you are doing is?

@valeriamorales9077 4 года назад

Man I was struggling to understand this in my Anatomy class and you just made it so easy and detailed well enough to understand every step. THANK YOU

@integrateapproximate4000 6 месяцев назад

Thank you so much for your great vids. I was having trouble with this last night but you made everything crystal clear!

@hasmirsiddique4159 Год назад

I learned more from your videos than from my teachers. Thanks man. Could you pls add the cardiac cycle time and explain it. Thanks again.

@margielavarias1490 4 года назад

Thank you so much! I couldn't understand this concept until I watched your video! I am learning it in a way that makes so much sense by your clear explanation and illustrations. God bless

@studentxcmu 4 года назад

Why isn’t there any professor that is so good at teaching?

@Rh92887 6 лет назад

I would pay to get subtitles on your videos! Very nice job!

@brunaiglesias5542 2 года назад

Mantaining the yearly appreciation comment for this amazing channel and for you! Thank you!

@amalomer7466 2 года назад

U make everything make sense!!! جزاك الله خير

@heyheypimpin 5 лет назад

Dear ninja nerd, I'm buying your merch to support you !!! Cannot thank you enough for all you do, please continue to keep up the good work, all us med students greatly appreciate you!

@NinjaNerdOfficial 5 лет назад

Thank you so much!!!

@shivanishivani4705 2 года назад

It's very very very easily and clearly explained. 😱 It seems to be so simple now. Thank you for this brief and nice explanation.

@sattaradunor599 5 лет назад

Thank you,! Thank you so much because for the life in me I could not understand this cycle until you explain it step by step. You are amazing

@047-aparnadeepgupta6 4 года назад

Oh God!! How could I forget about tomorrow's viva.. it's already 11:55 pm ...I'm gone now....oh wait I have ninja nerd... that's more than enough ❤️❤️❤️ thank you ninja nerds😘😘

@mduplooy6763 2 года назад

Zach, times a hundred, thank you! No one tops your videos

@tumukugizeemmanuel7587 Год назад

Going my physiology exam tommorow. This is helpful. Thank you.

@robinbentley7937 3 года назад

Thank you for this very clear walk through of the cardiac cycle!

@ghulamfatimarajper5330 2 года назад

He is amazing in his work as his looks are🌷

@RoyalCaoCao 4 года назад

Had to re-watch this entire video twice to fully understand and grasp the concept. But my professor thinks he can mumble it through in his 5 minutes slides and expect me to know it all.

@BLOODM00N13 3 года назад

mine didn't even explain everything, she said we should know all this already, idk where she thinks we should have learned this, but we hadn't and it sucks, but i'm glad this channel exists otherwise i'd be lost by now