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GCSE Combined Science · key term
A specialised surface across which substances move between an organism and its environment, or between body compartments.
Used by AQA and Edexcel
Specification 4.1.3.1 · Paper 1
Revise: Surface area to volume ratios and specialised exchange surfacesA high ratio means there is plenty of exchange surface for a relatively small amount of living material. A low ratio means each unit of surface must supply a larger volume.
Paper 1, Paper 2
A surface across which substances move between an organism and its environment, or between different regions within an organism.
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In a human, for example, oxygen crosses a lung exchange surface into the blood, then the blood transports it to cells throughout the body.