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Osmosis and Diffusion Semi-Permeable membrane – allows some things through and keeps other things out (Also called selectively permeable)

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Presentation on theme: "Osmosis and Diffusion Semi-Permeable membrane – allows some things through and keeps other things out (Also called selectively permeable)"— Presentation transcript:

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2 Osmosis and Diffusion

3 Semi-Permeable membrane – allows some things through and keeps other things out (Also called selectively permeable)

4 Diffusion is the movement of particles across a semi-permeable membrane

5 Particles move from an area of higher concentration to an area of lower concentration. Generally, smaller particles move this way, and larger particles cannot get through.

6 Osmosis is the diffusion of water

7 Osmosis and Diffusion are both forms of Passive Transport – they require NO ENERGY BrainPopPassive BrainPopPassive

8 In order for larger molecules to move through the membrane, or for particles to move from low to high concentration, energy is needed. This is called Active Transport.

9 Which way will the particles move?

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11 What if they had to move the other way?

12 They would have to move by Active Transport and this would require energy


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