Exchange surface
What Exchange surface means in Combined Science GCSE, as defined for AQA.
Definitions of Exchange surface
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Reference: AQA
A surface where substances cross a thin membrane, which is one adaptation of an efficient exchange surface alongside a large surface area and a steep concentration gradient.
A surface such as alveoli in the lungs or villi in the small intestine, adapted to maximise diffusion and supported by an efficient blood supply.
Topics that use Exchange surface
- Diffusion (AQA GCSE)
Related terms
- Adaptations of exchange surfaces
- Blood supply
- Cell size and organism size
- Concentration gradient
- Diffusion
- Diffusion and exchange surfaces
- Diffusion distance
- Exchange surfaces
Using Exchange surface in the exam
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