AS Biology - Cardiac cycle (OCR A Chapter 8.5)
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- Опубліковано 20 лют 2020
- The cardiac cycle largely splits into three stages: heart diastole, atrial systole and ventricular systole. When the cardiac muscles contract, the chambers push the blood out of it and into another chamber or out of the heart, down the pressure gradient. This involves pushing the valves (at the exit of the chamber) open, while the previous valves (at the entrance of the chamber) would close to prevent the backflow of blood during the chamber contraction.
In this video, we will explore how the contractions of the heart chambers lead to pressure changes, which then leads to the opening/closing of valves to facilitate efficient blood flow down the pressure gradient.
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I've been struggling for two years to understand this one cycle and one week before my exam I've found this. You've saved my life :)
Literally discovered your chanel a couple weeks ago and your explanations are amazing, thank you for everything
Haha glad to be of help! Thanks for watching :D
best video on the cardiac cycle graph I've ever seen- well done and thank you!
Glad it helped! Thanks for watching :D
Saving struggling A level students every day - thank you BioRach!
A million 'thank yous' isnt enough to show my appreciation rn
No joke, I watched tons of videos about this, all of which were long and boring, this video is concise and gets the information across very well, thank you so much
Glad to be of help! Thanks for watching :)
literally best video explaining cardiac cycle on !! Tysm 🥰
little update, using this video to revise for paper three tomorrow. you've been a massive saver to my grades and i genuinely believe i stand a chance now at getting into my uni and passing biology. thank you so much yet again you are a naturally born teacher :)
All the best tomorrow!!! 🥳🥳
I have y12 mocks in a week and your whole channel has become so helpful!
I just wanna say thank you sooo much for all these video's, they are seriously life savers for someone who struggles in biology. Thank you sooo much🙂🙂🙂
I also wanted to ask whether you consider doing videos just based on exam techniques for long answers and applications questions.
Haha glad to be of help! :D Yes it's something that I've been thinking about for a while now, will definitely plan something concrete! :)
@@BioRach can't wait for that 😊😊😊
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Your videos are literally saving me. I have my end of year bio exams on the 22nd & 23rd. If I get a good grade I'll definitely buy you a coffee! Thank you
Glad you find the videos helpful! All the best on your revision :)
literally needed this omg ty
Haha yeah this has been highly requested! Glad you found it helpful, thanks for watching :)
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Very well explained, love ur handwring and diagrams. Keep up the hard work. Thank you
Glad you found them useful! Thanks for watching :D
Thank you so so much!!!!!! your efforts mean the world to us for real
love the way u explained it, I finally understand this
You are an actual LIFESAVER you don't even know. Need to present this topic and turn it into a ppt by tomorrow morning, and I've been trying to comprehend and understand this topic for a week or more. You put it so simply and make it so easy!!! Thank you so much ma'am. :]
Edit: I just subscribed
Glad to help! :D
This has to be the best video I’ve seen explaining cardiac cycle, thankyou!
an entire HERO :)💕
Haha glad to be of help! Thanks for watching :D
Thank you so much! I could not get my head around this but I finally get it now :)
Thank you for all you do
Beautifully explained! Thankyou
this video is the only thing that helped me understand this, so thank you :)
Haha it's a hard topic, glad it helped! Thanks for watching :)
Thank you so much ❤️
Great explanation!
your videos are saving my grades right now. thank you so much
Thank you so much
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THANK YOU I WAS GOING TO HAVE A BREAKDOWN BUT YOU SAVED ME :D
this is so helpful...especially since we have started to work at home! :)
Glad it helps! Thanks for watching :)
Thank you great explanation!
thank you queen for this video! explained it so well :)
Very Informative and well explained
Thank you so much! You are a life saver!
thanks, this video help me so much
great content btw. thanks
Yay you’re back! So helpful, thank you so much for your hard work (:
Haha yeah, just about! XD way too busy really... Glad you find it helpful, that makes my time spent worthwhile! Thanks for watching :D
Could you do some walk through exam papers ?
Thanks alot ts the best explanation ever
amazing video
Thank youuu🤩❤️
This is so helpful! Now being quarantined im finding teaching myself almost impossible, so this video really came in handy. Thank you so much!
I'm glad to hear that! It is a difficult time for students to self-learn a lot of these content, I'm glad that the videos help :) Thanks for watching!
THANK YOU SO SO MUCHHH
God bless you
I'd love to see a video on the internal and external structure and function of the heart whenever you can :)
I did make a video on heart structure but messed it up... I will re-record it again at some point! :D
@@BioRach Amazing, thank you! Finding it hard to visualise by the textbook alone so I know I could trust your videos to help :)
im in 2nd year med, and im still using your videos lol. i use to watch your videos during A level a lot
Thanks for the support, all the best in uni!! :D
Question: you said that we can look at the pressure in the aorta or pulmonary artery and it won’t make a difference but wouldn’t it make a difference as the pressure in the aorta is much higher than in the pulmonary artery? Thanks :)
Yes you're absolutely right! :) What I meant was that the general shape and change in pressure would be similar as the atria/ventricles contract at the same time, essentially making the blood flow the same in both sides of the heart.
Wow thank you so much! I just had a quick question: at intersection 1 and 3 what is the direction of blood flow because you said to always mention what direction the blood flows in? Thanks
For intersections 1 and 3, they are when the valves close to prevent the backflow of blood - those two points don't really describe the direction of blood flow, but rather how the blood "wants" to flow backwards (eg. from ventricles back to atria in point 1, and aorta back to ventricles in point 3), but it does not happen due to the closing of valves. Hope this clarifies it!
@@BioRach hey! So do you i should say blood wants to flow from ventricles back into atria but AV Valves close. What about points 2 and 4?
in the textbook, there are subsections such as atrio-ventricular valves, and semi-lunar valves, and there is a lot of detail, is that something separate or is that explained here just more concise???
Yes, that's what I'm explaining here but simplified :)
Hi ! is there a way I could get a copy of the diagram notes ? This was so helpful thank you!
Glad you found the video helpful :) I would encourage you to draw them out yourself which is an important step for you to properly process the information that you need to know, rather than just getting a copy of the notes. But if you really really need them, then DM me on Twitter/Facebook and I can send you a scanned copy of the notes for this chapter. Thanks for watching!
BioRach thank you !!
Well explained ..... 🙏 thank you .... but i have a question. Is the blood leaving the ventricle during ventricular systole oxygenated or deoxygenated 🤔🤔
The left and right ventricles both contract at the same time during ventricular systole, so there will be oxygenated AND deoxygenated blood coming out of the heart at the same time from both ventricles! Hope that makes sense :)
And thanks for watching!
@@BioRach oh it makes so much sense now ☺...... thank so much 🤗
at 8:19-8:21 shouldn't you say pulmonary vein instead of pulmonary arterty because from right ventricle blood goes to the lungs through the pulmonary vein? am I wrong? Thank you.
The right ventricle is connected to the pulmonary artery, because arteries always carry blood away from the heart. This makes it the only artery that carries deoxygenated blood.
Hope this makes sense!
@@BioRach Oh. Yeah.. Thank you Miss.
It was a false memory in my mind. Thank you for your clarification and time!
me: writing ba thump on my diagram
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lub dub vs ba thumb
The worst diagram in all of biology 😔
Fr 💀
It's not the easiest to understand, but hopefully this video helped you on this a bit more! I'm happy to answer questions if you've got any :)