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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