B3 Exchange & Transport

  • Created by: lilyhw9
  • Created on: 05-11-19 23:13


- The job of the lungs is to transfer oxygen to the blood and to remove waste carbon dioxide from it.

- To do this the lungs contain millions of little air sacs called the alveoli where gas exchange takes place

- The alveoli are specialisd to maximie the diffusion of oxygen and carbon dioxide.

-They have :

  • An enormous surface area (about 75m^2 in humans)
  • moist lining for dissolving gases
  • Vey thin walls
  • good blood supply


the gills are the gas exchange surface in fish

- Water (containing oxygen) enters the fish through the mouth and passes out through its gills. As this happens, oxygen diffuses fro the


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