Gas Exchange in Animals.

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  • Created by: izzy
  • Created on: 04-07-12 11:46

Fish

Fish have gills:

  • these are made up of thin layers of tissue.
  • the layers are thin so thay there's only a short distance for gases to difuse across.
  • gills are contained in a special gill cavity.
  • water is pumped over the gills constantly.

Gills don't work in air, as without water they stick together.

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Insects

  • Transport gases via tubes called tracheae or tracheal tubes.
  • Air gets to the tracheae through spiracles, which open when the insect needs oxygen, and close when they don't.
  • The tracheae have a moist lining, which the gases can diffuse though into the tissues.
  • There is no blood supply, but air is constantly pumped though.
  • The tracheae have a large surface area tand come into close contact with individual cells to make them very effective at gas exchange.
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Tadpoles and Frogs

Tadpoles: Have gills covering their bodies.

Frogs:

  • Tadpoles undergo metamorphasis.
  • exchange gases in both water and air.Adukt frogs can exchange gases in both water and air.
  • gas exchange takes place through the skin, which is very moist, and has a rich blood supply to aud the diffusion.Most gas exchange takes place through the skin, which is very moist, and has a rich blood supply to aud the diffusion.
  • simple pair of lungs for when it is on land.Frogs also have a very simple pair of lungs for when it is on land.
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