Gas exchange in Fish

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  • Created by: Eema003
  • Created on: 23-05-16 17:18
  • Fish have a water proof (Gas - tight) covering.
  • Have a small surface area to volume ratio
  • They have an evolved specialist internal gas exchange system called the gills.

Structure of the gills:

  • Made up of gill filaments.
  • Fillaments are stacked up in a pile.
  • At right angles to the filaments are the gill lamellae.
  • This increases the surface area of the gills.
  • Water is taken in from the mouth and forced over the gills.

The countercurrent principle:

  • Countercurrent flow- The water flows over the lamellae in one direction and the flow


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