Plasma membrane notes

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Plasma membrane notes

  1. 1. Notes: Plasma Membrane (page 8)
  2. 2. Notes: Plasma Membrane (page 8)• Maintains the proper concentration of materials inside a cell by controlling the passage of materials in and out of the cell
  3. 3. Notes: Plasma Membrane (page 8)• Maintains the proper concentration of materials inside a cell by controlling the passage of materials in and out of the cell• Selectively permeable: allows some materials to pass through while keeping others out
  4. 4. Notes: Plasma Membrane (page 8)• Maintains the proper concentration of materials inside a cell by controlling the passage of materials in and out of the cell• Selectively permeable: allows some materials to pass through while keeping others out• All cells have a plasma membrane
  5. 5. Notes: Plasma Membrane (page 8)• Maintains the proper concentration of materials inside a cell by controlling the passage of materials in and out of the cell• Selectively permeable: allows some materials to pass through while keeping others out• All cells have a plasma membrane• Made of phospholipids plus proteins, carbohydrates, and cholesterol
  6. 6. Phospholipids• “Head” end hydrophilic (loves water)
  7. 7. Phospholipids• “Head” end hydrophilic (loves water)• “Tail” end hydrophobic (hates water)
  8. 8. Phospholipids• “Head” end hydrophilic (loves water)• “Tail” end hydrophobic (hates water)
  9. 9. Phospholipids• “Head” end hydrophilic (loves water)• “Tail” end hydrophobic (hates water)• Form a bi-layer with hydrophobic tails in the middle and hydrophilic heads pointed outward
  10. 10. Proteins• Can be attached to the surface or embedded in the membrane
  11. 11. Proteins• Can be attached to the surface or embedded in the membrane• Involved in transport through the membrane
  12. 12. Proteins• Can be attached to the surface or embedded in the membrane• Involved in transport through the membrane• Channel proteins form “tunnels” that allow substances through the membrane
  13. 13. Proteins• Can be attached to the surface or embedded in the membrane• Involved in transport through the membrane• Channel proteins form “tunnels” that allow substances through the membrane• Carrier proteins bind to substances and carry them through the membrane
  14. 14. Carbohydrates• Attached to the surface of the cell
  15. 15. Carbohydrates• Attached to the surface of the cell• Help cells to identify other cells
  16. 16. Cholesterol• Embedded in membrane
  17. 17. Cholesterol• Embedded in membrane• Helps stabilize and strengthen the cell membrane
  18. 18. Cholesterol• Embedded in membrane• Helps stabilize and strengthen the cell membrane• Hydroxyl (OH) group is oriented to the outside

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