Exchange of gases in the lungs

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  • Created by: Chris
  • Created on: 02-01-13 18:05

Essential features of exchange surfaces:

  • They have a large surface area to volume ratio to speed up the rate of exchange 
  • They are very thin, keeping the diffusion pathway short so materials can cross rapidly 
  • They are partially permeable allowing selected materials to diffuse easily 
  • There is movement of the internal medium (blood) to maintain a diffusion gradient

Role of alveoli in gas


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