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Features Exchange State Efficient Surfaces.  Surfaces Increased Area

Efficient exchange surfaces are characterized by increased surface area, thin layers, a good blood supply, and ventilation to maintain a diffusion gradient.

Four features of efficient exchange surfaces are: increased surface area, thin layers, a good blood supply, and ventilation to maintain a diffusion gradient.

Front State 4 features of efficient exchange surfaces. 
Back Features of exchange surfaces:
  • Increased surface area
  • Thin layers
  • Good blood supply
  • Ventilation to maintain diffusion gradient

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