Subjects
Maths
Chemistry
Biology
English Language
History
Responding to change (a2 only)
Infection and response
Homeostasis and response
Energy transfers (a2 only)
Cell biology
Organisms respond to changes in their internal and external environments (a-level only)
Biological molecules
Organisation
Substance exchange
Bioenergetics
Genetic information & variation
Inheritance, variation and evolution
Genetics & ecosystems (a2 only)
Ecology
Cells
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Britain & the wider world: 1745 -1901
1l the quest for political stability: germany, 1871-1991
The cold war
Inter-war germany
Medieval period: 1066 -1509
2d religious conflict and the church in england, c1529-c1570
2o democracy and nazism: germany, 1918-1945
1f industrialisation and the people: britain, c1783-1885
1c the tudors: england, 1485-1603
2m wars and welfare: britain in transition, 1906-1957
World war two & the holocaust
2n revolution and dictatorship: russia, 1917-1953
2s the making of modern britain, 1951-2007
World war one
Britain: 1509 -1745
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Biology
11 Dec 2025
449
4 pages
Jess Ford @jessrevision._x
Your heart works tirelessly to pump blood around your body, but sometimes it needs medical help to keep... Show more
Cardiovascular disease affects your heart and blood vessels, with coronary heart disease being the most common type. Think of your arteries like motorway lanes - when cholesterol builds up, it's like having roadworks that slow everything down.
Stents are tiny metal tubes that doctors insert into blocked arteries to push cholesterol aside and keep blood flowing smoothly. They're brilliant because they lower your risk of heart attacks, last for years, and you'll recover from the surgery pretty quickly.
However, stents aren't perfect. There's always some risk with surgery, plus potential complications like infections or blood clots forming around the stent.
💡 Quick Tip Stents work like scaffolding inside your arteries - they hold everything open so blood can flow freely!
Statins are daily tablets that tackle cholesterol differently - they reduce bad cholesterol in your bloodstream and slow down future build-up. They're ace because they boost good cholesterol (HDL) and can prevent other diseases too.
The downside? You must remember to take them every single day, and some people experience nasty side effects like kidney problems, nerve damage, or memory issues. Plus, they take ages to start working properly.
Artificial hearts sound like science fiction, but they're real! You don't need to wait for a donor, and there's less worry about rejection or blood group matching. Unfortunately, survival rates are quite low, they don't last long, they're incredibly expensive, and they simply don't work as well as real hearts.
💡 Remember Prevention is always better than cure - a healthy lifestyle reduces your need for these treatments!
Sometimes your heart's valves get damaged and stop working properly - imagine trying to drink through a straw with holes in it! When valves leak, blood flows backwards instead of forwards, making your heart work much harder.
Doctors can replace faulty valves with biological valves (from animals or donors) or mechanical valves (made from metal and plastic). Biological valves cause fewer blood clots but might get infected or rejected by your immune system. Mechanical valves last much longer but increase clot risks and need lifelong medication.
Artificial blood isn't a complete replacement for real blood, but it's a brilliant emergency substitute. It keeps people alive even when they've lost two-thirds of their red blood cells - pretty amazing really!
Your heart has its own natural pacemaker - special cells in the right atrium that send electrical signals to control your heartbeat.
💡 Fun Fact Your natural pacemaker fires about 100,000 times per day without you even thinking about it!
When your natural pacemaker fails, doctors can implant an artificial pacemaker under your skin with a wire connecting to your heart. This device sends electrical pulses to keep your heart beating at the right rhythm - it's like having a backup generator for your heart!
Risk factors for coronary heart disease include things you can't control (like genetics) and things you can. Smoking, drinking too much alcohol, eating loads of saturated fats, being inactive, and obesity all increase your chances of heart problems.
The good news? Most of these risk factors are completely within your control. Regular exercise, a balanced diet, and avoiding smoking can massively reduce your risk of needing any of these treatments.
Understanding these treatments helps you appreciate how incredible modern medicine is, but remember - looking after your heart naturally is always the best option!
💡 Take Action Small lifestyle changes now can prevent major heart problems later - your future self will thank you!
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
23
Smart Tools NEW
Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines
Explore the causes, risk factors, and treatments for Coronary Heart Disease (CHD). This summary covers the impact of blocked arteries, lifestyle influences, and treatment options like stents and bypass surgery. Ideal for students studying cardiovascular health.
BiologyExplore the causes, effects, and treatments of Coronary Heart Disease (CHD), a major cardiovascular condition. This summary covers the buildup of fat in coronary arteries, the risk of heart attacks, and effective treatments like stents and statins. Ideal for students studying cardiovascular health.
BiologyExplore the causes, risk factors, and treatments of cardiovascular disease (CVD) in this comprehensive summary. Learn about the impact of diet, cholesterol levels, and lifestyle choices on heart health. This resource covers essential information for GCSE students, including the role of statins and preventive measures against coronary heart disease.
BiologyExplore the intricacies of the mammalian heart, blood circulation, and plant tissues. This study note covers key concepts such as cardiovascular treatments, disease prevention, plant transpiration, and the role of enzymes in digestion. Ideal for AQA Biology students seeking to understand human anatomy, physiology, and plant responses.
BiologyExplore key concepts of coronary heart disease, including causes, risk factors like smoking and poor diet, and treatment options such as angioplasty and stenting. This summary is tailored for AQA Combined Biology GCSE students, providing essential information for understanding cardiovascular health.
BiologyExplore the key concepts of human body organization, focusing on the circulatory and digestive systems. This summary covers the structure and function of major organs, including the heart, lungs, and digestive tract, essential for AQA Combined Science revision.
BiologyApp Store
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
Jess Ford
@jessrevision._x
Your heart works tirelessly to pump blood around your body, but sometimes it needs medical help to keep going strong. Let's explore the clever treatments doctors use to fix heart problems and keep people healthy.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Cardiovascular disease affects your heart and blood vessels, with coronary heart disease being the most common type. Think of your arteries like motorway lanes - when cholesterol builds up, it's like having roadworks that slow everything down.
Stents are tiny metal tubes that doctors insert into blocked arteries to push cholesterol aside and keep blood flowing smoothly. They're brilliant because they lower your risk of heart attacks, last for years, and you'll recover from the surgery pretty quickly.
However, stents aren't perfect. There's always some risk with surgery, plus potential complications like infections or blood clots forming around the stent.
💡 Quick Tip: Stents work like scaffolding inside your arteries - they hold everything open so blood can flow freely!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Statins are daily tablets that tackle cholesterol differently - they reduce bad cholesterol in your bloodstream and slow down future build-up. They're ace because they boost good cholesterol (HDL) and can prevent other diseases too.
The downside? You must remember to take them every single day, and some people experience nasty side effects like kidney problems, nerve damage, or memory issues. Plus, they take ages to start working properly.
Artificial hearts sound like science fiction, but they're real! You don't need to wait for a donor, and there's less worry about rejection or blood group matching. Unfortunately, survival rates are quite low, they don't last long, they're incredibly expensive, and they simply don't work as well as real hearts.
💡 Remember: Prevention is always better than cure - a healthy lifestyle reduces your need for these treatments!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Sometimes your heart's valves get damaged and stop working properly - imagine trying to drink through a straw with holes in it! When valves leak, blood flows backwards instead of forwards, making your heart work much harder.
Doctors can replace faulty valves with biological valves (from animals or donors) or mechanical valves (made from metal and plastic). Biological valves cause fewer blood clots but might get infected or rejected by your immune system. Mechanical valves last much longer but increase clot risks and need lifelong medication.
Artificial blood isn't a complete replacement for real blood, but it's a brilliant emergency substitute. It keeps people alive even when they've lost two-thirds of their red blood cells - pretty amazing really!
Your heart has its own natural pacemaker - special cells in the right atrium that send electrical signals to control your heartbeat.
💡 Fun Fact: Your natural pacemaker fires about 100,000 times per day without you even thinking about it!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
When your natural pacemaker fails, doctors can implant an artificial pacemaker under your skin with a wire connecting to your heart. This device sends electrical pulses to keep your heart beating at the right rhythm - it's like having a backup generator for your heart!
Risk factors for coronary heart disease include things you can't control (like genetics) and things you can. Smoking, drinking too much alcohol, eating loads of saturated fats, being inactive, and obesity all increase your chances of heart problems.
The good news? Most of these risk factors are completely within your control. Regular exercise, a balanced diet, and avoiding smoking can massively reduce your risk of needing any of these treatments.
Understanding these treatments helps you appreciate how incredible modern medicine is, but remember - looking after your heart naturally is always the best option!
💡 Take Action: Small lifestyle changes now can prevent major heart problems later - your future self will thank you!
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
23
Smart Tools NEW
Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines
Explore the causes, risk factors, and treatments for Coronary Heart Disease (CHD). This summary covers the impact of blocked arteries, lifestyle influences, and treatment options like stents and bypass surgery. Ideal for students studying cardiovascular health.
BiologyExplore the causes, effects, and treatments of Coronary Heart Disease (CHD), a major cardiovascular condition. This summary covers the buildup of fat in coronary arteries, the risk of heart attacks, and effective treatments like stents and statins. Ideal for students studying cardiovascular health.
BiologyExplore the causes, risk factors, and treatments of cardiovascular disease (CVD) in this comprehensive summary. Learn about the impact of diet, cholesterol levels, and lifestyle choices on heart health. This resource covers essential information for GCSE students, including the role of statins and preventive measures against coronary heart disease.
BiologyExplore the intricacies of the mammalian heart, blood circulation, and plant tissues. This study note covers key concepts such as cardiovascular treatments, disease prevention, plant transpiration, and the role of enzymes in digestion. Ideal for AQA Biology students seeking to understand human anatomy, physiology, and plant responses.
BiologyExplore key concepts of coronary heart disease, including causes, risk factors like smoking and poor diet, and treatment options such as angioplasty and stenting. This summary is tailored for AQA Combined Biology GCSE students, providing essential information for understanding cardiovascular health.
BiologyExplore the key concepts of human body organization, focusing on the circulatory and digestive systems. This summary covers the structure and function of major organs, including the heart, lungs, and digestive tract, essential for AQA Combined Science revision.
BiologyApp Store
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
Sociology