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13 cards from this deck
Small & everything close to cell membrane
Bigger, cells far from outside environment
High - lots of surface area compared to volume
Gets smaller - less surface compared to volume
Large SA, short diffusion distance, good blood supply
More space for materials to move, increases exchange rate
Often just one cell thick
Maintains concentration gradients by moving materials
Tiny finger-like structures in small intestine
Millions of tiny air sacs in lungs
Thin structures in fish gills that increase surface area
One cell thick
Villi in small intestine
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