Adaptation in the Lungs
- Created by: chickpeatweet
- Created on: 19-11-14 18:47
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- Adaptation in the Lungs
- Diffusion Pathway
- Capillaries one cell thick
- Alveoli walls are very thin
- Are easily damaged
- Capillaries closely line the walls of the alveoli
- Oxygen does not have far to diffuse so can do so quickly
- Surface Area
- The alveoli are very small and there are many
- There is a larger exchange surface so more oxygen/CO2 can diffuse at once
- Diffusion/concentration gradient
- Ventilation maintains a medium
- inhale air with higher concentration of oxygen
- exhale air containing higher concentrations of CO2
- Blood circulation maintains medium
- Removal of blood containing higher concentrations of oxygen
- Oxygen diffuses faster as there is a greater diffusion gradient
- Ventilation maintains a medium
- Capillaries are very narrow
- Red blood cells are slowed - more time for diffusion
- Only a few red blood cells can pass through at one time
- Diffusion Pathway
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