Hello, I really hope this video helps with your Biology😊 For more help, quizzes and study tips follow me on Instagram @MissEstruchBiology instagram.com/missestruchbiology/?hl=en OR if you want to get your hands on some A-level NOTES READY MADE by me with key marking points, keywords, and essay links, make your way to missestruch.com/ (this will be available from July 2021 - Can't wait?? email missestruch@gmail.com to get your hands on a copy before then).
I really gotta thank you for this amazing video. i for once actually understood what the cardiac cycle is and the graph. You taught me the thing me teacher couldnt teach me in 6 months. plz keep going and make such videos to help us.
I am an Edexcel IAL student doing AS (A1) level in May...This video really helped me to understand everything related to the CC.. Specially the graphical representation of pressure changes, which i really had trouble understanding! Thank you so much for the explanation! ❤✨ Wish i had discovered this sooner. 🙈
@@The_FutureDoc that's great!!! congratulations 🎉 btw I've heard this thing that Oct exams are more harder than Jan and June ones. is that true or just a myth?
@@birdie7344 Thank you!❤ Tbh i have no idea regarding that but like when I do past papers of unit 4,5,6 I sorta realize that october papers are a bit tough for me personally :( Specially Physics..But I dont think it is the same case whatsoever...All depends on how well you know the theories and the practice u have :) Good Luck pal!
Hello, When the semilunar valves open (so blood must be flowing from the ventricles to the aorta in this example), why does the pressure in the ventricles continue to increase? Am I right in thinking it’s because the ventricles are still contracting?
Hello, Yes that is exactly it. The muscular walls in the ventricles are very thick, especially in the left ventricle, so can contract with a lot of force. Even though the semi-lunar valve opens, this contraction continues to increase the pressure inside the ventricles.
@@birdie7344 wow! thanks for asking. did my as exams last year, achieving full ums in all units & all subjects (all 300/300). have my a2 exams starting very soon, so hoping they go well
During atrial systole, when you say that pressure increases when volume decreases, do you mean the volume of blood or the volume of the atrium chamber decreases because it is contracting?
Hi, in general, are the valves in the heart closed at rest (when blood isn't being let through them)? Why is the AV valve open during diastole? Why are blood clots a bad thing and how do blood clots block arteries? and for AQA, how much do you need to know about heart diseases? Thank you
Hiya, I can't answer the first 2 questions but blood clots are a bad thing because it means that the area where the clot is - it's being starved of nutrients + oxygen, since the clot is like a "road closed" sign in the middle of a road and you can't go past it. Blood clots block arteries often due to lifestyle - high non-healthy fat diets, lots of sugar, etc. They can also block it due to genetics. But as a general rule - the blood clot will stop in the middle of the artery or before the artery - and because it's a blood clot: it doesn't allow anything to go past it, so no nutrients & oxygen are getting past. Hence the strong chest pain reported in individuals with heart attacks - the heart is not getting enough of what it needs, so it signals (pain).
Hi @3.35 you said that as the atrial contracts this will cause a loss of volume and this leads to an increase in pressure behind the ventricular valves. Sorry if silly question but if volume decreases does this not lead to a DECREASE in pressure or do you mean that due to loss volume and the contraction this causes an iNCREASE in pressure behind the valve...and allows blood to get pushed through. Thank you
Hey, the loss in volume refers to the space in the atria, not volume if blood. So the size of the atria decreases, which increases the pressure. Hope that helps
Great video, but I have a question. My school uses the CGP AQA alevel Biology and for the mass transport topic it goes into depth on cardiovascular diseases and atheroma formation, thrombosis etc. However looking at the specification it doesn’t mention anything about that, but for CHD it only mentions to. “Analyse and interpret data associated with specific risk factors and the incidence of this”, now I’m confused as I’ve seen you haven’t done any videos on this topic (or am I missing it), so my question is do I need to know about atheroma etc or not?
Check the year of publication of that book in case its only relevant for the old specification. Heart diseases were on the AQA specification prior to 2015,but are not on the current AQA specification that has been in place since 2015. Hope that helps
On the new AQA spec point 3.3.4.1 (Mass transport in animals) at the very bottom it says ‘Students should be able to ...’ and it talks about cardiovascular disease there, so I think you do need to know it?? Correct me if not though
The atria contact first because of the SAN (natural pacemaker) tissues in the right atrium. You learn about this in the control of the cardiac cycle part of the specification in Year 2 of A-level. The SAN is a group of cells which release a wave of depolarisation, and this causes the cardiac muscle to contract. This wave reaches the atria first.
The volume, as in the internal space, increase. So the pressure decreases as the internal space (volume) increases, not to the volume of blood present. Hope that helps
At this early stage of diastole, the aorta is full of blood and the semilunar valves have just shut, so blood can't flow backwards. This increase in volume of blood in the aorta causes a brief increase in pressure before the blood is flows to the rest of the body
Hello, I currently working through the AQA specification to completion, and this isn't on the AQA spec. Once I have finished that I will be broadening what I cover though.
I've seen an exam question about the heartbeat and the mark scheme talked about the Bundle of His and the SAN, but I've never actually been taught this? So I'm a bit confused - help, please! 🥲
Hello,
I really hope this video helps with your Biology😊
For more help, quizzes and study tips follow me on Instagram @MissEstruchBiology instagram.com/missestruchbiology/?hl=en
OR if you want to get your hands on some A-level NOTES READY MADE by me with key marking points, keywords, and essay links, make your way to missestruch.com/ (this will be available from July 2021 - Can't wait?? email missestruch@gmail.com to get your hands on a copy before then).
finally understood the cardiac cycle after watching this! i have my mocks soon and i was so worried i wouldn't understand this, thankyou!!
So pleased that this video helped you understand this topic. Best of luck for you mocks!
I have been struggling with this section but until this when I finally understand. Thank you so much
You're very welcome! So pleased it helped you to understand it :)
never really understood this til now, tysm! (:
So pleased it helped you understand this topic 😀
quite helpful for the edexcel ial spec, thank you!!
Much love from Ghana 🇬🇭
Thank you!!!
This video really breaks it down in such a simple way. Thank you so much
You're very welcome!
I study the OCR specification, but obviously AQA and OCR are very similar, I always visit your videos because their so useful!! Thank you so much!
You're so welcome! Yup, lots of overlap and similarities between the two exam boards. Glad the videos are helping you.
I really gotta thank you for this amazing video. i for once actually understood what the cardiac cycle is and the graph. You taught me the thing me teacher couldnt teach me in 6 months. plz keep going and make such videos to help us.
yay I'm so happy I helped! And good news, I already have videos that cover the ENTIRE A level!!
Idk why I didnt find your channel earlier 😭
Hopefully it helps you from now!
Thank you so much I finally get this!
That's great ☺ Really pleased it helped you understand this topic better!
I am an Edexcel IAL student doing AS (A1) level in May...This video really helped me to understand everything related to the CC.. Specially the graphical representation of pressure changes, which i really had trouble understanding! Thank you so much for the explanation! ❤✨ Wish i had discovered this sooner. 🙈
Wow so glad it helped you so much. 😊 Thank you!
how'd it go?
@@birdie7344 Hey! I got 3As for A1 last year with 260/300 UMS for bio...Doing the final A2 exam of A Levels this May in two weeks lol :)
@@The_FutureDoc that's great!!! congratulations 🎉 btw I've heard this thing that Oct exams are more harder than Jan and June ones. is that true or just a myth?
@@birdie7344 Thank you!❤ Tbh i have no idea regarding that but like when I do past papers of unit 4,5,6 I sorta realize that october papers are a bit tough for me personally :( Specially Physics..But I dont think it is the same case whatsoever...All depends on how well you know the theories and the practice u have :) Good Luck pal!
Yay, thank you I actually get it now!!! 👍🏼😊
That's great!
I'm uploading a video on dihybrid inheritance and autosomal linkage this evening too.
@@MissEstruchBiology ok
I have a test on the heart next monday so this will be useful
eeek good luck!
Thank you so much miss! ❤ I’m having my exams in Jan and your videos are helping a lot!!
You're so welcome!!! So pleased it helped
Super helpful thank you!!
Thank you :D
Glad it was helpful!
a total lifesaver thank you sm
You're so welcome!
Thank you so much madam I understood 💗
You are welcome 😊
love this!!
Thank you :) !
Thank you so much, i was so confused in lesson today
I'm so pleased it helped clarify everything for you 😊
Does the cardiac cycle happen at the same time for both sides of the heart?
Hello,
Yes, that's right.
amazing content so clear and understandable
Thank you!!!!
TQ Miss ESTRUCH
Hope it helps you 🤞😊
14:02 how will blood trickle down into the ventricles if the AV valves are closed ??
Is the short delay before ventricular systole because the ventricles are filling with blood?
That's the benefit of the delay, but it caused by the non-conductive tissue between the atria and ventricles.
Hello,
When the semilunar valves open (so blood must be flowing from the ventricles to the aorta in this example), why does the pressure in the ventricles continue to increase? Am I right in thinking it’s because the ventricles are still contracting?
Hello,
Yes that is exactly it. The muscular walls in the ventricles are very thick, especially in the left ventricle, so can contract with a lot of force. Even though the semi-lunar valve opens, this contraction continues to increase the pressure inside the ventricles.
Miss Estruch okay, thank you.
Thank you!
You're welcome 😊 Glad it help
Thanks , It helps me so much.
So pleased it helps 😀
Thank you🥰
You’re welcome 😊
very helpful thank you
Glad it helped you 😊
Thank you😁😁
You're welcome 😊
Brilliant !
thank you 😊
thumbed up my darg! Excellent work there helped me!
Subbed and liked
keep it up my yung drilla and ull be blessed
Peace
goodness gracious me
Do we need to talk about the nodes and bundle of His?
yes, that's in topic 6 though (control of cardiac cycle)
I love you Thanks for this video
So glad you liked it 😊 Best if luck for your studies
Endless thanks!! Helped for Edexcel specification :)
ahhh that's great it helped for your specification too 😀
@@MissEstruchBiology
Thanks again :)) Appreciate your efforts !!
@@mariamassi9617 how'd the exams go? :)
@@birdie7344 wow! thanks for asking. did my as exams last year, achieving full ums in all units & all subjects (all 300/300). have my a2 exams starting very soon, so hoping they go well
@@mariamassi9617 omg that's amazing!!! congratulations! 🎉 have u got any tips? I'll be doing my AS this year too
what were ur subjects btw?
Thank you 💓💕
You make the topic understandable
Love from Pakistan ❤
I'm so pleased the videos are helping you!
Why doesn't the increase in ventricular volume cause an increase in ventricular pressure during atrial systole?
During atrial systole, when you say that pressure increases when volume decreases, do you mean the volume of blood or the volume of the atrium chamber decreases because it is contracting?
I think she means volume of blood, not 100% sure though.
Why does the pressure not increase in the ventricles when blood enters it?
it does slightly, but the large and noticeable pressure increase is once the ventricle is full and contracts.
Hi, in general, are the valves in the heart closed at rest (when blood isn't being let through them)? Why is the AV valve open during diastole?
Why are blood clots a bad thing and how do blood clots block arteries? and for AQA, how much do you need to know about heart diseases? Thank you
Hiya, I can't answer the first 2 questions but blood clots are a bad thing because it means that the area where the clot is - it's being starved of nutrients + oxygen, since the clot is like a "road closed" sign in the middle of a road and you can't go past it. Blood clots block arteries often due to lifestyle - high non-healthy fat diets, lots of sugar, etc. They can also block it due to genetics. But as a general rule - the blood clot will stop in the middle of the artery or before the artery - and because it's a blood clot: it doesn't allow anything to go past it, so no nutrients & oxygen are getting past. Hence the strong chest pain reported in individuals with heart attacks - the heart is not getting enough of what it needs, so it signals (pain).
Thank u
you're welcome
Hi @3.35 you said that as the atrial contracts this will cause a loss of volume and this leads to an increase in pressure behind the ventricular valves. Sorry if silly question but if volume decreases does this not lead to a DECREASE in pressure or do you mean that due to loss volume and the contraction this causes an iNCREASE in pressure behind the valve...and allows blood to get pushed through. Thank you
Hey, the loss in volume refers to the space in the atria, not volume if blood. So the size of the atria decreases, which increases the pressure. Hope that helps
Can please do the ecg and the waves
Hello, I'm on maternity leave at the moment so I am not making any new videos for a while, just uploading prerecorded content.
Does the order in which we label the cardiac cycle matter? I put 1. Atrial Systole 2. Ventricular Systole 3. Diastole
It matters because the heart works in a certain way - you can't mix & match the way the heart works or it's irregular heartbeat.
Thank you😍love from pakistan
Hello 👋🏻
So glad you liked the video ☺
Great video, but I have a question. My school uses the CGP AQA alevel Biology and for the mass transport topic it goes into depth on cardiovascular diseases and atheroma formation, thrombosis etc. However looking at the specification it doesn’t mention anything about that, but for CHD it only mentions to. “Analyse and interpret data associated with specific risk factors and the incidence of this”, now I’m confused as I’ve seen you haven’t done any videos on this topic (or am I missing it), so my question is do I need to know about atheroma etc or not?
Check the year of publication of that book in case its only relevant for the old specification. Heart diseases were on the AQA specification prior to 2015,but are not on the current AQA specification that has been in place since 2015.
Hope that helps
On the new AQA spec point 3.3.4.1 (Mass transport in animals) at the very bottom it says ‘Students should be able to ...’ and it talks about cardiovascular disease there, so I think you do need to know it?? Correct me if not though
why do the atria contract at the very beginning? Or is pressure just higher due to blood flowing into the atria
The atria contact first because of the SAN (natural pacemaker) tissues in the right atrium. You learn about this in the control of the cardiac cycle part of the specification in Year 2 of A-level.
The SAN is a group of cells which release a wave of depolarisation, and this causes the cardiac muscle to contract. This wave reaches the atria first.
at diastole, the vol of ventricles increase, so shouldn't the pressure in ventricles decrease?
The volume, as in the internal space, increase. So the pressure decreases as the internal space (volume) increases, not to the volume of blood present.
Hope that helps
on the summary table at diastole, there is slow increase in vol of ventricles, and slow increase in pressure in ventricles??
Why does the aortas pressure temporarily rise in the start of diastole x
At this early stage of diastole, the aorta is full of blood and the semilunar valves have just shut, so blood can't flow backwards. This increase in volume of blood in the aorta causes a brief increase in pressure before the blood is flows to the rest of the body
I wonder if you have Patreon? Thank you for your work!
Hey I don't, but might create some classes next year
Hi, why does the pressure decrease in ventricle at diastole?
Hello,
As the ventricles relax the volume of the chamber increases and this decreases the pressure.
Hope that helps ☺
@@MissEstruchBiology Aaah oh ok! Thank you! Also, Thank you for the amazing resources and videos! They are really good!! :)
How do u calculate heart rate from data or a graph?
It depends on the axis you have. If its volume against time then you counting the number of peaks in a set time (each peak represents one beat)
Then convert that to beats per minute ( depending on the time frame you had)
Legend
Hello 👋 👋 👋 👋 👋 👋
heyyy
I’m here at 1 am with my bio end of year mock at 8am tomorrow lol
eeek good luck! I hope you got some sleep too 😴
@@MissEstruchBiology update I fucked it
Please can you do a video on cardiovascular disease and their risk factors? :D
Hello,
I currently working through the AQA specification to completion, and this isn't on the AQA spec. Once I have finished that I will be broadening what I cover though.
I've seen an exam question about the heartbeat and the mark scheme talked about the Bundle of His and the SAN, but I've never actually been taught this? So I'm a bit confused - help, please! 🥲
hello, that comes up in topic 6 of Y13. Y12 you just have to know the cycle ,not what controls the cycle 😊
@@MissEstruchBiology Thank you