Biology › Section P · Breathing, circulation, and excretion › Topic P.5
The mammalian heart and blood vessels
Your heart is two pumps working side by side, beating more than 100,000 times a day without a single conscious command. Its chambers, valves, wiring and vessels show structure fitted to function as clearly as anything in biology.
In this topic
- Two pumps in one
- Four chambers and the path of blood
- Valves: one-way doors
- Heart wall and coronary supply
- Cardiac muscle
- The cardiac cycle
- The heart's wiring
- Worked example: heart rate from an ECG
- Worked example: tracing one red blood cell
- Arteries, capillaries and veins
- Common mistakes to avoid
- Key takeaways
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