diffusion & osmosis
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
Diffusion & OsmosisDiffusion & Osmosis
Define Diffusion Define Diffusion
Define DiffusionDefine Diffusion
The movement of molecules from a The movement of molecules from a area in which they are highly area in which they are highly concentrated to a area in which they concentrated to a area in which they are less concentrated. are less concentrated.
-Food Coloring Demonstration-Food Coloring Demonstration
Draw a diagram of an Draw a diagram of an example of diffusion we example of diffusion we
saw in class.saw in class.
Draw a diagram of an example of Draw a diagram of an example of diffusion we saw in class.diffusion we saw in class.
See an animation of See an animation of diffusion here:diffusion here:
http://lewis.eeb.uconn.eduhttp://lewis.eeb.uconn.edu/lewishome/applets/Diffusi/lewishome/applets/Diffusion/diffusion.htmlon/diffusion.html
Define osmosisDefine osmosis
Define osmosisDefine osmosis
The diffusion of The diffusion of waterwater across a across a selectively permeable selectively permeable membranemembrane. .
Define OsmosisDefine Osmosis
Water moves from a Water moves from a
high concentration high concentration of water (less salt of water (less salt or sugar dissolved or sugar dissolved in it) to a low in it) to a low concentration of concentration of water (more salt or water (more salt or sugar dissolved in sugar dissolved in it). it).
http://www.usd.edu/~bgoodman/Osmos.htm
Define osmosisDefine osmosis In this picture a red blood In this picture a red blood
cell is put in a glass of cell is put in a glass of distilled water (all water distilled water (all water with no salt or sugar in it). with no salt or sugar in it). Because there is a higher Because there is a higher concentration of water concentration of water outside the cell, water outside the cell, water enters the cell by enters the cell by OSMOSISOSMOSIS. In this case too . In this case too much water enters and the much water enters and the cell swells to the point of cell swells to the point of bursting open. In the end bursting open. In the end pieces of cell membrane pieces of cell membrane are left in the water. are left in the water.
http://www.usd.edu/~bgoodman/Osmos.htm
See an animation of See an animation of osmosis here:osmosis here:
http://lewis.eeb.uconn.eduhttp://lewis.eeb.uconn.edu/lewishome/applets/Osmos/lewishome/applets/Osmosis/osmosis.htmlis/osmosis.html
Define selectively Define selectively permeable membrane permeable membrane
Define selectively permeable Define selectively permeable membranemembrane
A membrane that allows only certain A membrane that allows only certain materials to cross it materials to cross it
Materials pass through Materials pass through porespores in the in the membranemembrane
For more information on For more information on diffusion & osmosis, click diffusion & osmosis, click
here:here:
http://edtech.clas.pdx.edu/osmosis_thttp://edtech.clas.pdx.edu/osmosis_tutorial/default.htmlutorial/default.html
Why are osmosis & Why are osmosis & diffusion important?diffusion important?
Why are osmosis & diffusion Why are osmosis & diffusion important?important?
All living things have certain requirements they All living things have certain requirements they must satisfy in order to remain alive. must satisfy in order to remain alive.
These include exchanging gases (usually CO2 and These include exchanging gases (usually CO2 and O2), taking in water, minerals, and food, and O2), taking in water, minerals, and food, and eliminating wastes. eliminating wastes.
These tasks ultimately occur at the cellular level.These tasks ultimately occur at the cellular level.
They all require that molecules move through the They all require that molecules move through the membrane that surrounds the cell. membrane that surrounds the cell.
Review Osmosis & Review Osmosis & Diffusion Here:Diffusion Here:
http://wappingersschools.org/WJhttp://wappingersschools.org/WJH/teachers/science/Jim_Site/asigH/teachers/science/Jim_Site/asignments/cells/diffusionetc/diffusinments/cells/diffusionetc/diffusion_osmosis.htmlon_osmosis.html