A-Level Biology and Chemistry revision notes | ExamKata

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AQA Biology · Topic 3

Organisms exchange substances with their environment

4 subtopics · 4 notes written · Year 1

3.1Surface area to volume ratioWhat the ratio is, and why it matters · How the ratio changes with size · Adaptations of exchange surfacesRead 3.2Gas exchangeWhat makes a good gas exchange surface · Gas exchange in a single-celled organism · Gas exchange in an insect: the tracheal systemRead 3.3Digestion and absorptionDigestion is hydrolysis · Carbohydrate digestion · Lipid digestion: bile salts and lipaseRead 3.4Mass transportHaemoglobin and the transport of oxygen · The oxyhaemoglobin dissociation curve · The cooperative nature of oxygen bindingRead