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Cellular Processes Diffusion and Osmosis
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Concentration (p.16) Concentration: the number of molecules of a substance in a given volume Low Concentration High Concentration - Think of Juice from concentrate : you have to add water. This is really concentrated fruit juice that needs to have water added to it to make it lower in concentration
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Diffusion (p.16) Diffusion is the movement of particles from an area of high concentration to low concentration until all the particles are evenly distributed Watch DEMO. (food colour in 3 beakers) How does diffusion affect the size of a cell?
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Why is diffusion important?
Diffusion is an essential cell process. It is responsible for moving things around in cells. It occurs: Within a cell: movement of substances from one organelle to another Across a cell membrane: oxygen diffuses through cell membranes into cells, carbon dioxide waste diffuses back out. Outside a cell in body fluids: nerve cells communicate with each other by releasing chemicals which diffuse between the spaces between cells
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Osmosis (p.17) Osmosis is the movement of water molecules
across a semi-permeable membrane in response to concentration differences. Semi-permeable membranei
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Osmosis 45 sec. Water Salt + Water
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Osmosis 2min
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Egg in corn syrup then water (4min)
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Diffusion explained (39 sec)
example (40 sec)
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