Respiratory organs

  
  • Through Plasma Membrane. In unicellular animals, such as amoeba, exchange of gases takes place through cell surface.
  • Through Body Wall or Skin. Tapeworms, earthworms, and leeches use their skin for the exchange of gases.
  • Through Tracheal System.  Eg: Insects.
  • Through Gills. Eg:  Fish
  • Through lungs. Eg: Human beings.
 


     Respiration in Animals

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