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GCSE Combined Science · key term
The distance particles must travel by diffusion between two regions.
Used by OCR
Specification B2.2a · Biology Paper 1
Revise: Exchange Surfaces and Surface Area to Volume RatioAn efficient exchange surface has a large area, allowing many particles to cross at once, and a thin barrier, keeping the diffusion distance short.
Link a small surface area:volume ratio to insufficient exchange for the volume of cells, and a long diffusion distance to slow diffusion.
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