Key Facts: Heart and Circulation
Part of The Heart and Circulation · GCSE GCSE Biology revision
This key facts covers Key Facts: Heart and Circulation within The Heart and Circulation for GCSE Biology. Heart structure, cardiac cycle, blood vessels, double circulation, heart rate control, and cardiovascular health It is section 10 of 15 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 10 of 15
Practice
30 questions
Recall
25 flashcards
Key Facts: Heart and Circulation
- 4 chambers: 2 atria (top), 2 ventricles (bottom)
- 4 valves prevent backflow of blood
- Made of cardiac muscle - never tires
- Has its own blood supply (coronary arteries)
- Arteries: Carry blood away from heart (thick walls, high pressure)
- Veins: Carry blood to heart (thin walls, low pressure, valves)
- Capillaries: Microscopic vessels for exchange (one cell thick)
- Pulmonary: Heart → Lungs → Heart (oxygenation)
- Systemic: Heart → Body → Heart (delivery)
- Prevents mixing of oxygenated and deoxygenated blood
- Maintains high pressure to body organs
- Systole: Heart contracts, blood pumped out
- Diastole: Heart relaxes, chambers fill
- Complete cycle takes ~0.8 seconds at rest
- Heart sounds: "lub-dub" from valve closure
Keep building this topic
Read this section alongside the surrounding pages in The Heart and Circulation. That gives you the full topic sequence instead of a single isolated revision point.
Practice Questions for The Heart and Circulation
How many chambers does the human heart have?
Explain how the structure of an artery is related to its function.
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