Unit 3 Cell Membranes, Diffusion, And Osmosis

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Unit 3 Cell Membranes, Diffusion, And Osmosis

  1. 1. Plant cells have cell walls and chloroplasts.<br />A cell wall provides rigid support.<br />
  2. 2. Plant cells have cell walls and chloroplasts.<br />A cell wall provides rigid support.<br />Chloroplasts convert solar energy to chemical energy.<br />
  3. 3. KEY CONCEPT The cell membrane is a barrier that separates a cell from the external environment.<br />
  4. 4. Cell membranes are composed of two phospholipid layers.<br />
  5. 5. Cell membranes are composed of two phospholipid layers.<br />The cell membrane has two major functions.<br />cell membrane<br />
  6. 6. Cell membranes are composed of two phospholipid layers.<br />The cell membrane has two major functions.<br />forms a boundary between inside and outside of the cell<br />cell membrane<br />outside cell<br />inside cell<br />
  7. 7. Cell membranes are composed of two phospholipid layers.<br />The cell membrane has two major functions.<br />forms a boundary between inside and outside of the cell<br />controls passage of materials<br />cell membrane<br />outside cell<br />inside cell<br />
  8. 8. Cell membranes are composed of two phospholipid layers.<br />
  9. 9. cell membrane<br />Cell membranes are composed of two phospholipid layers.<br />The cell membrane is made of a phospholipid bilayer.<br />
  10. 10. Cell membranes are composed of two phospholipid layers.<br />The cell membrane is made of a phospholipid bilayer.<br />There are other molecules embedded in the membrane.<br />carbohydrate<br />chain<br />protein<br />cell membrane<br />cholesterol<br />protein<br />protein channel<br />
  11. 11. Cell membranes are composed of two phospholipid layers.<br />The cell membrane is made of a phospholipid bilayer.<br />There are other molecules embedded in the membrane.<br />The fluid mosaic model describes the membrane.<br />carbohydrate<br />chain<br />protein<br />cell membrane<br />cholesterol<br />protein<br />protein channel<br />
  12. 12. Cell membranes are composed of two phospholipid layers.<br />
  13. 13. Cell membranes are composed of two phospholipid layers.<br />The cell membrane is selectively permeable.<br />Some molecules can cross the membrane while others cannot.<br />
  14. 14. Cell membranes are composed of two phospholipid layers.<br />The cell membrane is selectively permeable.<br />Some molecules can cross the membrane while others cannot.<br />
  15. 15. Chemical signals are transmitted across the cell membrane.<br />Receptors bind with ligands and change shape.<br />There are two types of receptors.<br />
  16. 16. Chemical signals are transmitted across the cell membrane.<br />Receptors bind with ligands and change shape.<br />There are two types of receptors.<br />intracellular receptor<br />
  17. 17. Chemical signals are transmitted across the cell membrane.<br />Receptors bind with ligands and change shape.<br />There are two types of receptors.<br />intracellular receptor<br />membrane receptor<br />
  18. 18. KEY CONCEPT Materials move across membranes because of concentration differences.<br />Diffusion and Osmosis<br />
  19. 19. Passive transport does not require energy input from a cell.<br /><ul><li>Molecules can move across the cell membrane through passive transport.
  20. 20. There are two types of passive transport.
  21. 21. diffusion
  22. 22. osmosis </li></ul>Diffusion and Osmosis<br />
  23. 23. Diffusion and osmosis are types of passive transport.<br /><ul><li>Molecules diffuse down a concentration gradient. </li></ul>Diffusion and Osmosis<br />
  24. 24. Diffusion and osmosis are types of passive transport.<br /><ul><li>Osmosis is the diffusion of water molecules across a semipermeable membrane. </li></ul>Diffusion and Osmosis<br />
  25. 25. Diffusion and osmosis are types of passive transport.<br /><ul><li>There are three types of solutions.
  26. 26. isotonic
  27. 27. hypertonic
  28. 28. hypotonic</li></li></ul><li>Some molecules can only diffuse through transport proteins.<br /><ul><li>Some molecules cannot easily diffuse across the cell membrane.
  29. 29. Facilitated diffusion is diffusion through transport proteins. </li></ul>Diffusion and Osmosis<br />
  30. 30. KEY CONCEPT Cells use energy to transport materials that cannot diffuse across a membrane.<br />Active Transport, Endocytosis, and Exocytosis<br />
  31. 31. Active transport requires energy input from a cell and enables a cell to move a substance against its concentration gradient.<br /><ul><li>Passive transport requires no energy from the cell.
  32. 32. Active transport is powered by chemical energy (ATP).
  33. 33. Active transport occurs through transport protein pumps.
  34. 34. Cells use active transport to maintain homeostasis. </li></li></ul><li>A cell can import and export large materials or large amounts of material in vesicles during the processes of endocytosis and exocytosis.<br /><ul><li>Cells use energy to transport material in vesicles.
  35. 35. Endocytosis is the process of taking material into the cell.
  36. 36. Phagocytosis is a type of endocytosis. </li></ul>Active Transport, Endocytosis, and Exocytosis<br />
  37. 37. A cell can import and export large materials or large amounts of material in vesicles during the processes of endocytosis and exocytosis.<br /><ul><li>Cells use energy to transport material in vesicles.
  38. 38. Exocytosis is the process of expelling material from the cell. </li></ul>Active Transport, Endocytosis, and Exocytosis<br />

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