Diffusion and Osmosis animations

Dear all,

A few other links to animations that I;ve shown to you in class, in case you would like to relook at them =)

http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_diffusion_works.html

http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_osmosis_works.html

Crenation in animal cells

Recall the following (the table that I asked you to copy in your textbook):

Hypotonic solution (compared to the cell)
Plant cell: Become turgid
Animal cell: Swells and burst (Lysis)

Hypertonic solution (compared to the cell)
Plant cell: Becomes plasmolysed
Animal cell: Undergoes crenation

Crenation is the process in which cell shrinks and little spikes appear on the cell surface membrane.

In the following website, drag the mouse to the right and see how crenation occurs.
The more concentrated a solution is, the more hypertonic it is, the lower the water potential, hence water leaves the cell by osmosis to enter the solution.

http://www.yteach.co.uk/page.php/resources/view_all?id=Haemolysis_osmosis_diffusion_Plasmolysis_Facilitated_diffusion_Gradient_Passive_transport_Simple_diffusion_Active_transport_page_5&from=search