Gas exchange, Osmosis, active transport and diffusion
Mindmap about unit 1.2, diffusion and Osmosis and active transport
- Created by: James Robinson
- Created on: 28-03-13 10:19
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- Gas exchange and that
- Diffusion
- Greater difference in conc faster rate of diffusion
- Tea in water diffuses faster than tea in tea-ish water
- Goes from high to low conc
- Basically it spreads to where it isn't
- Greater difference in conc faster rate of diffusion
- Osmosis
- Basically Diffusion
- happens through partially permeable membrane
- Only with water
- Isotonic- conc of solutes inside= conc of solutes outside
- Hypotonic- conc of solutes inside> conc of solutes outside
- Hypertonic-conc of solutes inside<conc of solutes outside
- Hypotonic- conc of solutes inside> conc of solutes outside
- Key terms
- dilute- lots of water, not much sugar
- Concentrated-Lots of sugar, not much water
- Solvent- water
- Solute- sugar
- concentraation gradient- barrier between different concentrations
- Active transport
- Physically moving substances across the membrane
- More respiration= more energy= more active transport
- Moves substances from low conc to high conc.
- Going AGAINST the conc gradient
- Opposite to diffusion
- minerals can be absorbed from very dilute solutions
- Very important to plants
- Going AGAINST the conc gradient
- This is how materials are moved across gut linings in the intestine
- In multicellular organisms
- In animals
- Alvioli- large surface area- more active transport
- Thin membranes- short diffusion path
- Small intestine- Villi & microvilli= large surface area
- Nutrients absorbed here go into blood- transported round body
- In plants
- Root hair cells- large surface area= lot of active transport.
- Lots of them
- Root hair cells under soil, leaves over it= best of both worlds
- Root hair cells- large surface area= lot of active transport.
- In animals
- Diffusion
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