B1- cell biology (exchange surfaces)

B1- cell biology

exchange surfaces

• Cells can use diffusion to take in sustances they need and get rid of waste products
• How easy it is for an organism to exchange substances with its environment depends on the organism's surface area to volume ratio (SA:V)
• The larger the organism is, the smaller its surface area is compared to its volume

Comparing surface area to volume ratio

• Find volume and surface area of organisms
• To simplify the ratio, divide both sides by the volume
• Compare e.g. the cube mouse's SA is six times its volume where as the cube hippo's SA is only…