IGCSE Biology Notes: Heart & Circulation
IGCSE biology notes on circulation need a labelled heart diagram, blood vessel comparison table, and double circulation flow in four sentences.
Hub: IGCSE biology notes · Transport in humans · Gas exchange.
Heart notes
| Structure | Function note |
|---|---|
| Atria / ventricles | Chambers; left vs right |
| Valves | Prevent backflow — name them |
| Septum | Separates oxygenated/deoxygenated sides |
| Coronary vessels | Heart muscle oxygen |
Blood vessels table
| Vessel | Wall | Lumen | Valves |
|---|---|---|---|
| Artery | Thick elastic | Narrow | No |
| Vein | Thinner | Wide | Yes |
| Capillary | One cell thick | Very narrow | No |
Frequently asked questions
Red blood cell diagram?
Biconcave, no nucleus — link to cell specialisation.
Pulse rate practical?
Add method + variables to notes margin.
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