What is it
This topic covers how cells are organised into tissues, organs and organ systems, the structure and function of the human digestive and circulatory systems, enzyme action, and (in some specifications) plant tissues and transport.
Why it matters
Organisation ties cell biology to whole-body function and is one of the most heavily-weighted topics across all major exam boards, with the heart and enzymes both being perennial favourites in exam papers.
Exam tip
For enzyme questions, always mention the 'lock and key' model and optimum temperature/pH, and explain that denaturation changes the enzyme's active site shape — this exact explanation structure is what mark schemes look for.
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