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Diffusion, Osmosis, and the Cell Membrane. 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.
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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.
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.
Osmosis Example 1: Equal movement of water in and out of cells
Osmosis Example 2: More water moving into cells than is moving out
Osmosis Example 3: More water moving out of cells than is moving in