Specialised exchange surfaces
- Created by: elle1999
- Created on: 22-01-16 15:22
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- Specialised exchange surfaces
- Increased surface area
- Provides area needed for exchange
- Overcomes limitations of SA:V ratio.
- Root hair cells
- Thin layers
- Distance the substance diffuses is short- process fast and efficient.
- Alveoli
- Good blood supply
- Steeper the concentrationgradient, the faster the diffusion takes place
- Substances constantly delivered to and from surface
- Gills
- Ventilation to maintain diffusion gradient
- Maintains gradient
- Process more efficiently
- Gills- flow of water carrying dissolved gases.
- Increased surface area
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