Transport in Animals | IGCSE Biology by Science Sauce

1	Surface area to volume ratio
2	The Blood
3	White blood cells and the immune system
4	(P2) Immunity and vaccinations
5	(P2) Blood clotting
6	The heart and circulatory system
7	Heart rate
8	Blood vessels
9	Coronary heart disease

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Structure of the Heart

The Heartbeat Sound (lup-dup)

Heart Rate: How does the heart know what to beat faster?

Immunity: Active vs Passive

Cell Defence: Lymphocytes and Phagocytes