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Diffusion & Osmosis

Diffusion & Osmosis. Define Diffusion. Define Diffusion. The movement of molecules from a area in which they are highly concentrated to a area in which they are less concentrated. -Food Coloring Demonstration. Draw a diagram of an example of diffusion we saw in class.

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Diffusion & Osmosis

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  1. Diffusion & Osmosis

  2. Define Diffusion

  3. Define Diffusion The movement of molecules from a area in which they are highly concentrated to a area in which they are less concentrated. -Food Coloring Demonstration

  4. Draw a diagram of an example of diffusion we saw in class.

  5. Draw a diagram of an example of diffusion we saw in class.

  6. See an animation of diffusion here: http://lewis.eeb.uconn.edu/lewishome/applets/Diffusion/diffusion.html

  7. Define osmosis

  8. Define osmosis • The diffusion of water across a selectively permeable membrane.

  9. Define Osmosis • Water moves from a high concentration of water (less salt or sugar dissolved in it) to a low concentration of water (more salt or sugar dissolved in it).  http://www.usd.edu/~bgoodman/Osmos.htm

  10. Define osmosis • In this picture a red blood cell is put in a glass of distilled water (all water with no salt or sugar in it).  Because there is a higher concentration of water outside the cell, water enters the cell by OSMOSIS.  In this case too much water enters and the cell swells to the point of bursting open.  In the end pieces of cell membrane are left in the water. http://www.usd.edu/~bgoodman/Osmos.htm

  11. See an animation of osmosis here: http://lewis.eeb.uconn.edu/lewishome/applets/Osmosis/osmosis.html

  12. Define selectively permeable membrane

  13. Define selectively permeable membrane • A membrane that allows only certain materials to cross it • Materials pass through pores in the membrane

  14. For more information on diffusion & osmosis, click here: http://edtech.clas.pdx.edu/osmosis_tutorial/default.html

  15. Why are osmosis & diffusion important?

  16. Why are osmosis & diffusion important? • All living things have certain requirements they must satisfy in order to remain alive. • These include exchanging gases (usually CO2 and O2), taking in water, minerals, and food, and eliminating wastes. • These tasks ultimately occur at the cellular level. • They all require that molecules move through the membrane that surrounds the cell.

  17. Review Osmosis & Diffusion Here: http://wappingersschools.org/WJH/teachers/science/Jim_Site/asignments/cells/diffusionetc/diffusion_osmosis.html

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