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A-Level Biology OCR A

Increases Diffusion Sa:V Ratio Increasing Organism Oxygen Surface

With increasing organism size, diffusion distance grows, surface area expands, while volume increases at a faster rate, resulting in a decreased surface area to volume ratio.

As organisms increase in size, diffusion distance increases, surface area increases, and volume increases faster than surface area, leading to a decreased surface area to volume ratio.

Front Describe how diffusion distance, SA, volume, SA:V ratio vary with increasing organism size.
Back Increasing organism size:
  • Diffusion distance between cells where oxygen is needed and the supply of oxygen increases
  • Surface area increases
  • Volume increases at a faster rate than surface area so the SA:V ratio will decrease

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