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Osmosis

Osmosis. Passive Transport Review. Energy requirements? No energy required Modes of passive transport? Diffusion through cell membrane The movement of a substance from higher concentration to lower concentration Facilitated Diffusion

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Osmosis

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  1. Osmosis

  2. Passive Transport Review • Energy requirements? • No energy required • Modes of passive transport? • Diffusion through cell membrane • The movement of a substance from higher concentration to lower concentration • Facilitated Diffusion • Diffusion through the cell membrane via a channel protein If passive transport requires NO ENERGY, how do you think active transport differs?? • Active transport requires energy in order to cross the membrane

  3. Osmosis A mode of diffusion • Osmosis: the movement of water from a higher concentration to a lower concentration • “The Diffusion of water through a semi-permeable membrane”

  4. Results of Osmosis • Isotonic Solution- The water and solute concentration are in equal concentrations on the inside and outside of the cell • Equilibrium has been reached

  5. Results of Osmosis 2. Hypotonic Solution- The concentration of solute outside the cell is “less than” the concentration of solute inside the cell • So, there is more water outside the cell • Water moves into the cell • This causes the cell to expand, and perhaps, burst.

  6. Results of Osmosis 3. Hypertonic Solution- The solute concentration outside the cell is “higher than” the solute concentration inside the cell • Water concentration is greater inside the cell • Water moves out of the cell • Cell will shrivel, shrinking in size

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