M:3 S:1 Specialised Exchange Surfaces
- Created by: JessicaMPascoe
- Created on: 13-03-19 11:34
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- Specialised Exchange Surfaces
- Exchange surfaces
- Reactants for metabolic reactions
- Excrete waste products
- Carbon Dioxide
- Urea
- Multicellular organisms
- Large diffusion distances
- Low SA:VOL
- High metabolic rate
- Single celled organisms
- Features to improve efficiency
- Large SA
- Root Hair Cells
- Increases rate of absorption of water
- Good Bloody Supply
- Alveloi
- Absorbs O2
- CO2 diffuses into alveoli and breathed out
- Maintains concentration gradient of O2 and CO2
- Thin
- Alveoli
- One cell thick epithelium walls
- Decreases diffusion distance
- Increases rate of diffusion
- Large SA
- QUESTIONS
- Name 4 substances an organism needs to exchange with its environment
- How do the SA:VOL differ in small and large organisms?
- Give 2 ways in which alveoli are adapted for efficient gas exchange
- Suggest how microvilli increase the efficiency of nutrient absorption in the small intestine
- Why do multicelluar organisms need exchange surfaces?
- Exchange surfaces
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