Diffusion, Osmosis, and the Cell Membrane

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Diffusion, Osmosis, and the Cell Membrane
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Diffusion

• Diffusion is the movement of particles from an
  area of higher concentration to an area of lower
  concentration.
• Concentration is the amount of substance in a
  given space.
• The smell of fresh baked bread spreading
  throughout the room is an example of diffusion.

The diffusion of ink in water.
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Osmosis

• Osmosis is the diffusion of water through a
  selectively permeable membrane.
• Osmosis occurs when water particles move from a
  higher concentration to a lower concentration.

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Osmosis
Example 1 Equal movement of water in and out of
cells
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Osmosis

• Example 2 More water moving into cells than is
  moving out

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Osmosis

• Example 3 More water moving out of cells than is
  moving in