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10 cards from this deck
Nutrients, O₂, water in; waste (CO₂, urea) out
SA increases as x2x^2x2, volume as x3x^3x3
SA:V ratio decreases rapidly
High SA:V ratio & short diffusion distances
Diffusion distances to centre too great, cells would die
Flattened shapes, specialised surfaces, transport systems
Large surface area relative to volume
Very thin walls, often just one cell thick
Selective permeability - only specific materials cross
Folded inner surface of lungs, branched structure of gills
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