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Osmosis & Diffusion
Fichas del conjunto (6)
- 1Diffusion is the spread of liquid or gas particles from an area of high to low concentration, until there is an even distribution. e.g. spraying Impulse
- 2Osmosis is a type of diffusion where water molecules move from an area of high water concentration (dilute solution) to low water concentration across a semi permeable membrane, until it is Isotonic (equal concentrations)
- 3CASE ONE: ANIMAL CELL If an animal cell is placed into a beaker of distilled water (100% water), osmosis occurs here because....there is more water outside the cell in the beaker, than inside the cell (99.1%). Water moves through the Selectively Permeable cell membrane. As a result, the cytoplasm gets larger and the cell membrane may burst - called Lysis
- 4CASE TWO: ANIMAL CELL If an animal cell which contains 99.1% water is put in a solution with 98%, osmosis will occur because....there is more water inside the cell (99.1%) than outside (98%). Water moves across the Semi Permeable cell membrane to the outside. As a result, the cytoplasm loses water and the cell shrivels - called Crenation
- 5CASE THREE: ANIMAL CELL If an animal cell which is 99.1% water is placed in a solution which is 99.1% water, osmosis will NOT occur because....there is an equal amount of water on both sides of the cell membrane - called Isotonic
- 6Passive Transport: the movement of particles from more to less, down a concentration gradient, i.e. no energy needed. e.g. osmosis and diffusionActive Transport: the movement of particles from less to more, up a concentration gradient, i.e. energy is need.
e.g. uptake of minerals by roots of a plant from the soil
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- Leaving Certificate Biology Fichas sobre Osmosis & Diffusion, creado por Dani O'Rourke el 10/10/2013.
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- Dani O'Rourke
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