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A-level- CARDIAC CYCLE. Diastole, atrial systole, ventricular systoles +the pressure +volume changes

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Learn all the stages in the cardiac cycle: diastole, atrial systole, ventricular systole. I go through the volume and pressure changes and how these cause the semi-lunar and atrioventricular valves to open/close, the cardiac output calculation, and finish on a key graph analysis question.
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28 авг 2024

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Комментарии : 128

@MissEstruchBiology 3 года назад

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).

@ria.popatkar 3 года назад

finally understood the cardiac cycle after watching this! i have my mocks soon and i was so worried i wouldn't understand this, thankyou!!

@MissEstruchBiology 3 года назад

So pleased that this video helped you understand this topic. Best of luck for you mocks!

@tapkoang 3 года назад

I have been struggling with this section but until this when I finally understand. Thank you so much

@MissEstruchBiology 3 года назад

You're very welcome! So pleased it helped you to understand it :)

@maheentahseen9039 3 года назад

Idk why I didnt find your channel earlier 😭

@MissEstruchBiology 3 года назад

Hopefully it helps you from now!

@kiran4078 3 года назад

never really understood this til now, tysm! (:

@MissEstruchBiology 3 года назад

So pleased it helped you understand this topic 😀

@birdie7344 Год назад

quite helpful for the edexcel ial spec, thank you!!

@aftabahmadi564 3 года назад

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!

@MissEstruchBiology 3 года назад

You're so welcome! Yup, lots of overlap and similarities between the two exam boards. Glad the videos are helping you.

@The_FutureDoc 2 года назад

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. 🙈

@MissEstruchBiology 2 года назад

Wow so glad it helped you so much. 😊 Thank you!

@birdie7344 Год назад

how'd it go?

@The_FutureDoc Год назад

@@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 :)

@birdie7344 Год назад

@@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?

@The_FutureDoc Год назад

@@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!

@Ash_Nichole 6 месяцев назад

This video really breaks it down in such a simple way. Thank you so much

@MissEstruchBiology 6 месяцев назад

You're very welcome!

@noblehero6761 Год назад

Much love from Ghana 🇬🇭

@MissEstruchBiology Год назад

Thank you!!!

@haadiaasghar6707 2 года назад

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.

@MissEstruchBiology 2 года назад

yay I'm so happy I helped! And good news, I already have videos that cover the ENTIRE A level!!

@leahlester2620 4 года назад

Yay, thank you I actually get it now!!! 👍🏼😊

@MissEstruchBiology 4 года назад

That's great! I'm uploading a video on dihybrid inheritance and autosomal linkage this evening too.

@maazamaaza6704 3 года назад

@@MissEstruchBiology ok

@Isabel-xv7mr 3 года назад

Thank you so much I finally get this!

@MissEstruchBiology 3 года назад

That's great ☺ Really pleased it helped you understand this topic better!

@justsomeone2001 11 месяцев назад

Thank you so much miss! ❤ I’m having my exams in Jan and your videos are helping a lot!!

@MissEstruchBiology 11 месяцев назад

You're so welcome!!! So pleased it helped

@shreyashrestha5345 3 года назад

love this!!

@MissEstruchBiology 3 года назад

Thank you :) !

@chunkplunk 2 года назад

I have a test on the heart next monday so this will be useful

@MissEstruchBiology 2 года назад

eeek good luck!

@veronicahngina1475 3 года назад

Thank you so much madam I understood 💗

@MissEstruchBiology 3 года назад

You are welcome 😊

@flobawden5271 3 года назад

Super helpful thank you!!

@MissEstruchBiology 3 года назад

Thank you :D Glad it was helpful!

@shreyashrestha5345 3 года назад

TQ Miss ESTRUCH

@MissEstruchBiology 3 года назад

Hope it helps you 🤞😊

@otakugolv4187 11 месяцев назад

a total lifesaver thank you sm

@MissEstruchBiology 11 месяцев назад

You're so welcome!

@lecturesbyaemi7459 2 года назад

Thank you 💓💕 You make the topic understandable Love from Pakistan ❤

@MissEstruchBiology 2 года назад

I'm so pleased the videos are helping you!

@chayaspitzer2930 2 года назад

amazing content so clear and understandable

@MissEstruchBiology 2 года назад

Thank you!!!!

@NomanKhan-bd4st 3 года назад

thumbed up my darg! Excellent work there helped me! Subbed and liked keep it up my yung drilla and ull be blessed Peace

@Sara-sc6nm 3 года назад

goodness gracious me

@AM-xf8mu 3 года назад

Thank you😁😁

@MissEstruchBiology 3 года назад

You're welcome 😊

@paulseoighemcgee5772 2 года назад

Brilliant !

@MissEstruchBiology 2 года назад

thank you 😊

@whoneedsapillowwhenjinshou2660 2 года назад

Thank you so much, i was so confused in lesson today

@MissEstruchBiology 2 года назад

I'm so pleased it helped clarify everything for you 😊

@MatT-vf7qo 4 года назад

Does the cardiac cycle happen at the same time for both sides of the heart?

@MissEstruchBiology 4 года назад

Hello, Yes, that's right.

@ShadowMan-wq7ib 3 года назад

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?

@MissEstruchBiology 3 года назад

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.

@ShadowMan-wq7ib 3 года назад

Miss Estruch okay, thank you.

@brishtytalukder1656 4 года назад

Thank you🥰

@MissEstruchBiology 4 года назад

You’re welcome 😊

@melvinshinu4316 3 года назад

Thank you!

@MissEstruchBiology 3 года назад

You're welcome 😊 Glad it help

@primeroxx Год назад

14:02 how will blood trickle down into the ventricles if the AV valves are closed ??

@miinziiiiiii 3 года назад

Is the short delay before ventricular systole because the ventricles are filling with blood?

@MissEstruchBiology 3 года назад

That's the benefit of the delay, but it caused by the non-conductive tissue between the atria and ventricles.

@arinamohajeri9256 3 года назад

very helpful thank you

@MissEstruchBiology 3 года назад

Glad it helped you 😊

@deeakaftan4386 2 года назад

Thanks , It helps me so much.

@MissEstruchBiology 2 года назад

So pleased it helps 😀

@hussain55019 3 года назад

I love you Thanks for this video

@MissEstruchBiology 3 года назад

So glad you liked it 😊 Best if luck for your studies

@elizecloete4825 Год назад

Why doesn't the increase in ventricular volume cause an increase in ventricular pressure during atrial systole?

@emiliatoher129 Год назад

Do we need to talk about the nodes and bundle of His?

@MissEstruchBiology Год назад

yes, that's in topic 6 though (control of cardiac cycle)

@hussnain6114 3 года назад

Thank you😍love from pakistan

@MissEstruchBiology 3 года назад

Hello 👋🏻 So glad you liked the video ☺

@jasminehodges5907 3 года назад

Thank u

@MissEstruchBiology 3 года назад

you're welcome

@mariamassi9617 2 года назад

Endless thanks!! Helped for Edexcel specification :)

@MissEstruchBiology 2 года назад

ahhh that's great it helped for your specification too 😀

@mariamassi9617 2 года назад

@@MissEstruchBiology Thanks again :)) Appreciate your efforts !!

@birdie7344 Год назад

@@mariamassi9617 how'd the exams go? :)

@mariamassi9617 Год назад

@@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

@birdie7344 Год назад

@@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?

@skyestellar3653 2 года назад

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

@Barbara-Csillag 2 года назад

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).

@mikrokosmos1652 2 года назад

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?

@Barbara-Csillag 2 года назад

I think she means volume of blood, not 100% sure though.

@tescovaluetissues2610 Год назад

Legend

@deborahwest4671 Год назад

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

@MissEstruchBiology Год назад

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

@malikaturla 2 года назад

I wonder if you have Patreon? Thank you for your work!

@MissEstruchBiology 2 года назад

Hey I don't, but might create some classes next year

@hongjoongswife9672 3 года назад

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?

@MissEstruchBiology 3 года назад

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

@LM-xy1uj 3 года назад

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

@mohid0786 2 года назад

Does the order in which we label the cardiac cycle matter? I put 1. Atrial Systole 2. Ventricular Systole 3. Diastole

@Barbara-Csillag 2 года назад

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.

@jayansaini7093 2 года назад

Hello 👋 👋 👋 👋 👋 👋

@MissEstruchBiology 2 года назад

heyyy

@zanirapatel2807 4 года назад

why do the atria contract at the very beginning? Or is pressure just higher due to blood flowing into the atria

@MissEstruchBiology 4 года назад

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.

@veronicahngina1475 3 года назад

Can please do the ecg and the waves

@MissEstruchBiology 3 года назад

Hello, I'm on maternity leave at the moment so I am not making any new videos for a while, just uploading prerecorded content.

@everosie2083 3 года назад

Why does the aortas pressure temporarily rise in the start of diastole x

@MissEstruchBiology 3 года назад

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

@zombietron6080 2 года назад

at diastole, the vol of ventricles increase, so shouldn't the pressure in ventricles decrease?

@MissEstruchBiology 2 года назад

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

@zombietron6080 2 года назад

on the summary table at diastole, there is slow increase in vol of ventricles, and slow increase in pressure in ventricles??

@sjsnnsndxdnendnndd5939 3 года назад

I’m here at 1 am with my bio end of year mock at 8am tomorrow lol

@MissEstruchBiology 3 года назад

eeek good luck! I hope you got some sleep too 😴

@sjsnnsndxdnendnndd5939 3 года назад

@@MissEstruchBiology update I fucked it

@ishadissa819 3 года назад

Hi, why does the pressure decrease in ventricle at diastole?

@MissEstruchBiology 3 года назад

Hello, As the ventricles relax the volume of the chamber increases and this decreases the pressure. Hope that helps ☺

@ishadissa819 3 года назад

@@MissEstruchBiology Aaah oh ok! Thank you! Also, Thank you for the amazing resources and videos! They are really good!! :)

@Sara-sc6nm 2 года назад

How do u calculate heart rate from data or a graph?

@MissEstruchBiology 2 года назад

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)

@MissEstruchBiology 2 года назад

Then convert that to beats per minute ( depending on the time frame you had)

@DabSavageee 4 года назад

Please can you do a video on cardiovascular disease and their risk factors? :D

@MissEstruchBiology 4 года назад

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.

@ayeshasidat5830 3 года назад

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! 🥲

@MissEstruchBiology 3 года назад

hello, that comes up in topic 6 of Y13. Y12 you just have to know the cycle ,not what controls the cycle 😊

@ayeshasidat5830 3 года назад

@@MissEstruchBiology Thank you

@MatT-vf7qo 4 года назад

Why does the pressure not increase in the ventricles when blood enters it?

@MissEstruchBiology 4 года назад

it does slightly, but the large and noticeable pressure increase is once the ventricle is full and contracts.