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A-Level Biology OCR A

Increased Surface Area Exchange Explain Increases Efficiency Needed

Increased surface area, exemplified by the villi in the small intestine, boosts exchange efficiency, facilitating diffusion and compensating for a lower surface area to volume ratio.

Increased surface area, such as in the villi of the small intestine, enhances exchange efficiency by providing more area for diffusion and overcoming a low surface area to volume ratio.

Front Explain how increased surface area increases efficiency of exchange surfaces. + example
Back Increased surface area:
  • Provides area needed for exchange and overcomes the low SA:V ratio of larger organisms, increasing diffusion rate
  • Example: villi in small intestine

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