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Diffusion

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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 ... – PowerPoint PPT presentation

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Title: Diffusion


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.

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//highered.mcgraw-hill.com/sites/0072495855/s
    tudent_view0/chapter2/animation__how_diffusion_wor
    ks.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).  This means that water would
    cross a selectively permeable membrane from a
    dilute solution (less dissolved in it) to a
    concentrated solution (more dissolved in it).

http//www.usd.edu/bgoodman/Osmos.htm
10
Define osmosis
http//www.usd.edu/bgoodman/Osmos.htm
11
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
12
See an animation of osmosis here
  • http//highered.mcgraw-hill.com/sites/0072495855/s
    tudent_view0/chapter2/animation__how_osmosis_works
    .html

13
Define selectively permeable membrane
14
Define selectively permeable membrane
  • A membrane that allows only certain materials to
    cross it
  • Materials pass through pores in the membrane

15
For more information on diffusion osmosis,
click here
  • http//edtech.clas.pdx.edu/osmosis_tutorial/defaul
    t.html

16
Why are osmosis diffusion important?
17
Why are osmosis diffusion important?
  • All living things have certain requirements they
    must satisfy in order to remain alive maintain
    homeostasis
  • These include exchanging gases (usually CO2 and
    O2), taking in water, minerals, and food, and
    eliminating wastes.
  • These tasks happen at the cellular level.
  • Molecules move through the cell membrane by
    diffusion

18
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, and require that molecules
    move through the membrane that surrounds the
    cell.

19
Why are osmosis diffusion important?
  • This membrane is a complex structure that is
    responsible for separating the contents of the
    cell from its surroundings, for controlling the
    movement of materials into and out of the cell,
    and for interacting with the environment
    surrounding the cell.

20
Review Osmosis Diffusion Here
  • http//www.mydoctorgames.com/diffusion/game/
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