B1 EXCHANGE SURFACES

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  • Created by: kerrylond
  • Created on: 01-05-18 20:12

EXCHANGE SURFACES

  • Cells use diffusion to take in substances they need and get rid of waste products
  • The larger an organism is, the smallers in surface area:volume ratio
  • In SINGLE-CELLED organisms, gases and dissolved substances can diffuse directly into/out of the cell across the cell membrane, they have a large surface area:volume ratio, so enough substances can be exchanged across the cell membrane to supply the volume of

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