Living Organisms
- Created by: Clare
- Created on: 22-02-13 16:16
View mindmap
- Living Organisms
- MRS GREN
- Movement
- Osmosis
- Only WATER
- Across a cell membrane
- Partially permeable (water gets through)
- Visking tubing (used in experiments)
- Experiment: sugar water solution in visking tubing moves into the higher water concentration
- High to low concentration of water
- Goes TO where there is more sugar concentration
- Diffusion
- The spread of particles through random motion
- From high to low concentration
- Gas exchange in the body
- Alveoli- oxygen enters the blood and carbon dioxide leaves
- Needs high concentration gradient between cells ad blood capillaries
- Active Transport
- When a substance goes the wrong way, against the concentration greadient
- From low to high concentration
- E.g.: more concentrated (in minerals) in the cells of root hairs than in soil
- Requires energy from aerobic respiratoipn
- Affected by
- Temperature
- Faster rate of reaction
- Concentration gradient
- Higher contrast between the 2 solutions travels faster
- Different concentrations needed to balance it out
- Surface area to volume
- Larger surface area= more gaps in the membrane= more osmosis
- Temperature
- Osmosis
Comments
No comments have yet been made