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13 cards from this deck
Distance - slow & inefficient over long distances
Volume increases faster than surface area
Lungs, gills, intestines
More area available for substances to diffuse across
Reduce distance, speeding up the process
Transports substances quickly to/from cells
Brings fresh O2, removes CO2, maintains gradient
O2 diffuses in, CO2 diffuses out of blood
Large surface area & thin walls
Villi & microvilli
Urea
Blood circulatory system
Respiration, nutrient uptake, waste removal
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