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Published byHarry Curtis Modified over 9 years ago
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Osmosis and Diffusion
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Semi-Permeable membrane – allows some things through and keeps other things out (Also called selectively permeable)
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Diffusion is the movement of particles across a semi-permeable membrane
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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.
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Osmosis is the diffusion of water
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Osmosis and Diffusion are both forms of Passive Transport – they require NO ENERGY BrainPopPassive BrainPopPassive
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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.
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Which way will the particles move?
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What if they had to move the other way?
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They would have to move by Active Transport and this would require energy
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