Surface area to volume ratio

Surface area to volume ratio 

I should be able to: 

• Use the idea of surface area to volume ratio to explain why multicellular organisms require exchange surfaces and a transport system. 

• Describe how gills increase the rate of transport of gases into and out of fish. 

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• Molecules move in and out of cells by diffusion. For example, oxygen diffuses into cells and carbon dioxide diffuses out.  

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• Amoeba are single-celled organisms. They have a huge surface area for their volume. This is the surface area: volume ratio. 

• Single-celled organisms such as an amoeba can rely on diffusion to transport molecules in and out of their cell. 

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• Surface area for each side = 1mm x 1mm = 1mm2 

• Total surface area…