Describe how a gill is structurally adapted as a respiratory surface (4marks)

 

  • Highly folded into filaments to increases surface area gaseous exchange
  • It is covered with a thin highly permeable membrane to reduce the diffusion distance.
  • It has a rich blood to increases the efficiency to gaseous exchange.
  • It’s wet in order to increase chance of picking up gases readily dissolve in the moisture.
  • Numerous filaments increase the surface area
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