exchange of gases in the lungs
- Created by: kjaneway1
- Created on: 11-04-15 21:22
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- gas exchange in humans
- Untitled
- features of exchange surfaces
- gas exchange in the lungs
- essential features in exchange surfaces
- a large surface area to volume ratio
- speed up rate of exchange
- very thin
- to keep diffusion pathway short to allow materials to pass rapidly
- partially permiable
- to allow selected materials to pass through rapidly
- movement of environmental medium
- to maintain diffusion gradient
- movement of internal medium
- to maintain diffusion gradient
- a large surface area to volume ratio
- role of the alveoli
- each alveolus has a network of pulmonary capillaries
- in them the red blood flattern against the outer lineing of the
- have rapid diffusion because
- alveoli and capillaries have large surface area
- distance between air and red blood cells reduced
- the blood cells are slowed more time for diffusion
- thin walls of alveoli and capillaries
- constant circulation of blood and air
- each alveolus has a network of pulmonary capillaries
- essential features in exchange surfaces
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