Diffusion and Osmosis-B4
- Created by: Shannon
- Created on: 01-05-13 18:11
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- Diffusion and Osmosis
- Diffusion- net movement of particles in a gas or liquid from an area of high concentration to low concentration
- Random movement
- How water, oxygen and CO2 enter and leave cells through the cell membrane
- Osmosis- the random movement of water through a partially permeable membrane from an area of high water concentration (diluted) to low water concentration (concentrated solution)
- Entry of water into plants increases pressure- turgor
- Water content shrinks- cell becomes plasmolysed and flaccid
- Cell full of water=turgid
- Animal cells lack a cell wall, could burst if too much water enters- lysis
- Crenation- too much water leaves the cell and it shrinks (scalloped shape)
- Rate can be increased by shorter distance to travel, steeper concentration gradient, greater surface area
- Diffusion- net movement of particles in a gas or liquid from an area of high concentration to low concentration
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