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Osmosis/Diffusion/Active Transport

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Osmosis/Diffusion/Active Transport

  1. 1. Diffusion and Osmosis Cell Processes:
  2. 2. <ul><li>Diffusion - the tendency of molecules to move from a higher concentration to a lower concentration until equilibrium is reached. </li></ul>Higher concentration on the left Equilizing out Equal on right & left Fully diffused
  3. 3. Diffusion video
  4. 4. Passive Transport <ul><li>Diffusion across a semi-permeable membrane (ex: cell membrane). </li></ul><ul><li>Cell does not use any energy for diffusion. It goes through the cell membrane without it opening up. </li></ul><ul><li>Examples – water, alcohol, O 2 and CO 2, </li></ul>Types of Movement in the Cell:
  5. 5. <ul><li>Osmosis - The diffusion of water </li></ul><ul><li>Cell membrane doesn’t open up, just goes through. Only works with very small particles. </li></ul>Osmosis Video
  6. 6. Hypertonic Solution <ul><li>Solution with a higher concentration of solute and a lower concentration of water. </li></ul><ul><li>Makes the cell shrivel. Example: adding salt water </li></ul>Video Link
  7. 7. Hypotonic Solution <ul><li>Solution with a lower solute concentration and a higher water concentration. </li></ul><ul><li>More water moves in than out. Cell bloats. Example: Being in the bath too long causes wrinkled fingers. </li></ul>Video link
  8. 8. Isotonic Solution <ul><li>Equal amount of water goes in and out of cell. </li></ul>Video link
  9. 9. Effect on living cells Animal Plant
  10. 10. Active Transport <ul><li>Cell uses energy to move things in and out. Example: food molecules </li></ul><ul><li>Cell membrane actually opens and closes. </li></ul>Active Transport Video
  11. 11. <ul><li>Endocytosis (substances “enter” the cell). </li></ul><ul><li>Ex: Food molecules </li></ul>Exocytosis & Endocytosis Exocytosis (molecules “exit” the cell. Ex: Waste products