Exchange Surfaces 0.0 / 5 ? BiologyExchange SurfacesASAQA Created by: me543Created on: 22-02-18 14:02 How can a unicellular organism cope with a lack of specialist exchange surfaces? They have a large SA:VOL ratio, and therefore the rate of diffusion is enough to fulfil their needs. 1 of 5 What is an exchange surface? A specialised area that is adapted to make it easier for molecules to pass from one side of the surface to the other 2 of 5 Name three examples of specialist exchange surfaces... tracheal system in insects, gills in fish, lungs in mammals 3 of 5 Why does the surface area need to be moist? So the molecules can dissolve and diffuse across 4 of 5 Main key features for efficient gas exchange? large SA, large SA:VOL ratio, thin barrier, good blood supply, ventilation, high conc. gradient, moist surface. 5 of 5
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