Diffusion
- Created by: sophiethea_2
- Created on: 30-09-18 12:05
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- Diffusion
- Movement of particles from a region of high concentration to a region of low concentration across a concentration gradient
- Lungs
- Alveoli causes gas exchange
- Adaptations to maximise diffusion
- Large surface area
- To increase the rate of diffusion
- Moist lining
- To stop the alveolus from drying & to dissolve gases
- Thin walls
- It decreases the path for diffusion which increases the rate
- Constant blood flow
- It maintains a concentration gradient
- Large surface area
- Adaptations to maximise diffusion
- Alveoli causes gas exchange
- Photosynthesis
- Plants
- Adaptations to maximise diffusion
- Flattened shape
- To increase area
- Air spaces
- Increases the amount of CO2 that can diffuse into the cell
- Flattened shape
- Adaptations to maximise diffusion
- Plants
- Gills
- Gas exchange in fish
- Adaptations to maximise diffusion
- Lamallae
- Increases surface area
- Lots of blood capillaries
- It speeds up diffusion
- Thin surface layer of cells
- To minimise the diffusion path
- Gill filaments
- Lamallae
- Adaptations to maximise diffusion
- Gas exchange in fish
- Digestion
- Occurs in the small intestine
- Villi cover the small intestine
- Adaptations to maximise diffusion
- Increasing surface area
- Digested food is absorbed quicker
- Good blood supply
- To assist quick absorption of digested food
- Thin walls
- To decrease diffusion path
- Extensive blood capillary network
- To carry away absorbed nutrients
- Increasing surface area
- Adaptations to maximise diffusion
- Villi cover the small intestine
- Occurs in the small intestine
- Passive process
- No energy is required
- It happens in gases and liquids
- No energy is required
- Factors that affect the rate of diffusion
- Temperature
- Higher temperature give the particles more kinetic energy so they move faster which increases the rate of diffusion
- Concentration
- Higher concentration of particles increases the rate of diffusion
- Surface area of membrane
- If the membrane is thinner the rate of diffusion increases because the path is shorter
- Temperature
- Big surface area
- To increase rate of gas exchange
- Gill filaments
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