Your heart is basically a powerful pump that keeps you...
Biology111 views·Updated Jun 8, 2026·2 pagesThe Heart: Structure, Function, and Diseases - AQA Biology
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Kiana Coheh@kianacoheh_fdcp
1
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The Heart Structure
Think of your heart as a four-room house with a clever traffic system. The four chambers work in pairs: two atria at the top (right and left atrium) and two ventricles at the bottom (right and left ventricle).
Here's how the blood journey works: deoxygenated blood from your body enters the right atrium through the vena cava, then flows down to the right ventricle. Meanwhile, oxygenated blood from your lungs enters the left atrium via the pulmonary vein, then moves to the left ventricle.
Heart valves are like one-way doors that prevent blood from flowing backwards. The tricuspid valve sits between the right atrium and ventricle, whilst the bicuspid valve does the same job on the left side. Semi-lunar valves guard the exits where blood leaves the heart through the pulmonary artery and aorta.
Key Point: The right side of your heart deals with deoxygenated blood going to the lungs, whilst the left side handles oxygenated blood going to the rest of your body.
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of 2
Heart Problems and Solutions
Coronary heart disease (CHD) happens when fatty deposits called atheroma build up in your coronary arteries - the blood vessels that feed your heart muscle. These deposits form plaques that narrow the artery, reducing blood flow and potentially causing heart attacks.
When heart valves go wrong, you get two main problems: stiff valves that won't open properly, or leaky valves that let blood flow backwards. Both make your heart work harder and can cause breathlessness. Doctors can replace damaged valves with biological valves (from animals or donors) or mechanical valves.
Modern medicine offers brilliant solutions for heart problems. Stents are tiny tubes inserted into blocked arteries to keep them open - they're highly successful and last ages. Artificial pacemakers fix irregular heartbeats by sending electrical signals to your heart, taking over from your natural pacemaker (a group of cells in the right atrium).
Remember: Your heart has its own built-in electrical system, but sometimes it needs a bit of technological help to keep the rhythm steady!
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Biology111 views·Updated Jun 8, 2026·2 pagesThe Heart: Structure, Function, and Diseases - AQA Biology
K
Kiana Coheh@kianacoheh_fdcp
Your heart is basically a powerful pump that keeps you alive by pushing blood around your entire body 24/7. Understanding how this amazing organ works and what can go wrong with it is crucial for your biology studies and for...
1
of 2
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The Heart Structure
Think of your heart as a four-room house with a clever traffic system. The four chambers work in pairs: two atria at the top (right and left atrium) and two ventricles at the bottom (right and left ventricle).
Here's how the blood journey works: deoxygenated blood from your body enters the right atrium through the vena cava, then flows down to the right ventricle. Meanwhile, oxygenated blood from your lungs enters the left atrium via the pulmonary vein, then moves to the left ventricle.
Heart valves are like one-way doors that prevent blood from flowing backwards. The tricuspid valve sits between the right atrium and ventricle, whilst the bicuspid valve does the same job on the left side. Semi-lunar valves guard the exits where blood leaves the heart through the pulmonary artery and aorta.
Key Point: The right side of your heart deals with deoxygenated blood going to the lungs, whilst the left side handles oxygenated blood going to the rest of your body.
2
of 2Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Heart Problems and Solutions
Coronary heart disease (CHD) happens when fatty deposits called atheroma build up in your coronary arteries - the blood vessels that feed your heart muscle. These deposits form plaques that narrow the artery, reducing blood flow and potentially causing heart attacks.
When heart valves go wrong, you get two main problems: stiff valves that won't open properly, or leaky valves that let blood flow backwards. Both make your heart work harder and can cause breathlessness. Doctors can replace damaged valves with biological valves (from animals or donors) or mechanical valves.
Modern medicine offers brilliant solutions for heart problems. Stents are tiny tubes inserted into blocked arteries to keep them open - they're highly successful and last ages. Artificial pacemakers fix irregular heartbeats by sending electrical signals to your heart, taking over from your natural pacemaker (a group of cells in the right atrium).
Remember: Your heart has its own built-in electrical system, but sometimes it needs a bit of technological help to keep the rhythm steady!
We thought you’d never ask...
What is the Knowunity AI companion?
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.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Similar content
Most popular content: Heart
9Most popular content in Biology
9Most popular content
9Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5App Store
4.7/5Google 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 SiOS 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 KlichAndroid 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.
AnnaiOS user