UTF-8
Default Starting Page
Osmosis: Diffusion across a semi-permeable membrane
A cell's membrane is an important example of semi-permeable membrane, controlling the diffusion between the inside and the outside of the cellular fluid.The membrane is specially engineered with a variety of openings, or pores, usually designed for specific molecules. Some pores allow particles to diffuse passively, without additional energy, across membrane; the rate is only limited by how many such pores are available. There are, for example, a large number of pores allowing water to pass back and forth. Other pores allow ions such as sodium and potassium to pass through.
Examine the following pictures:
Pictures from: The online biology book:
http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBooktransp.html#Cells%20and%20Diffusion
Based on your understanding of osmosis and your interpretation of the pictures above, imagine the following scenario:
You are hosting a party for your friends, so you go to the refrigerator to prepare your vegetable tray and vegetable dip and you notice the celery is limp. What would you do to make it crisp and crunchy?
When you are finished, create a report of this page:
<<Back | Next>>
1
trueComic Sans MS20
1
10.0
Comic Sans MS14
14
true14
10.0
true14
10.0
true14
trueComic Sans MS14
1
10.0
bloodcells.jpg
plantcell.jpg
1
true
1
true
8.0
14
8.0
14
8.0
14
8.0
14
1
8.0
org.concord.modeler.PageTextArea
400
197
<html>
<head>
</head>
<body>
<font size="3">Explain what you would do and what you think is happening
at the molecular level to justify what you chose to do.</font>
</body>
</html>
-1
true14
10.0
10.0
10.0
diffusion.membraneR2.cml
10.0
page8.cml
page9.cml