osmosis

osmosis - 1 2 Osmosis is a special case of diffusion...

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Osmosis is a special case of diffusion Osmosis involves the diffusion of water through a membrane The membrane may be artificial and non-living e.g. Cellophane In biology, the important membrane is the cell membrane 2
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If a concentrated solution is separated from a dilute solution by a suitable membrane, water will pass from the dilute to the concentrated solution. The membrane must allow water molecules to diffuse through. It is permeable to water. In fact, water passes both ways but faster from the dilute to the concentrated solution. Permeability 3
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Osmosis water or dilute solution concentrated solution membrane More water passes from dilute to concentrated . .. ...until concentrations become equal level rises level falls 4
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There are microscopic pores in the membrane. Molecules below a certain size can diffuse through the pores. Water molecules can easily diffuse through the pores. In the next slides represents a water molecule and represents a sugar molecule 5
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membrane water sugar solution There are as many water molecules on the right as there are on the left but many of them are attached to sugar molecules and are not free to move. 6
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Because there are more freely moving water molecules on the left, more diffuse through the pores of the membrane from left to right than from right to left. 7
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of a certain size to diffuse through it, it is called selectively permeable . The
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This note was uploaded on 11/29/2011 for the course BIO 218 taught by Professor Young during the Fall '11 term at BYU.

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osmosis - 1 2 Osmosis is a special case of diffusion...

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