Cell membrane structure

2,975 views

Published on

Published in: Technology
0 Comments
4 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
2,975
On SlideShare
0
From Embeds
0
Number of Embeds
3
Actions
Shares
0
Downloads
90
Comments
0
Likes
4
Embeds 0
No embeds

No notes for slide

Cell membrane structure

  1. 2. <ul><ul><li>Gatekeeper </li></ul></ul><ul><ul><li>Regulates what comes in and out of the cell </li></ul></ul><ul><ul><li>Main components: proteins and phospholipids </li></ul></ul><ul><ul><li>The cell membrane is selectively permeable </li></ul></ul><ul><ul><ul><li>Allows some things through without energy, but not everything </li></ul></ul></ul>
  2. 3. <ul><li>All cells have a cell membrane </li></ul><ul><li>Functions : </li></ul><ul><ul><li>Controls what enters and exits the cell to maintain an internal balance called homeostasis </li></ul></ul><ul><ul><li>Provides protection and support for the cell </li></ul></ul>TEM picture of a real cell membrane.
  3. 4. <ul><ul><li>Found only in plant cells and bacteria cells </li></ul></ul><ul><ul><li>Main function is support </li></ul></ul>
  4. 5. <ul><ul><li>phosopholipids </li></ul></ul><ul><ul><ul><li>made of two sides: head and tail </li></ul></ul></ul><ul><ul><ul><li>the head is hydrophillic (able to interact with water) </li></ul></ul></ul><ul><ul><ul><li>the tail is hydrophobic (not able to interact with water) </li></ul></ul></ul>
  5. 6. <ul><li>Structure of cell membrane </li></ul><ul><li>Lipid Bilayer -2 layers of phospholipids </li></ul><ul><ul><li>Phosphate head is polar (water loving) </li></ul></ul><ul><ul><li>Fatty acid tails non-polar (water fearing) </li></ul></ul><ul><ul><li>Proteins embedded in membrane </li></ul></ul>Phospholipid Lipid Bilayer
  6. 7. <ul><ul><li>carrier proteins </li></ul></ul><ul><ul><ul><li>allow larger or difficult molecules to get through the membrane </li></ul></ul></ul><ul><ul><ul><li>sometimes they require energy to open/close like a door </li></ul></ul></ul><ul><ul><ul><li>other times they simply act as a tunnel </li></ul></ul></ul>
  7. 8. Proteins Membrane movement animation Polar heads love water & dissolve. Non-polar tails hide from water . Carbohydrate cell markers Fluid Mosaic Model of the cell membrane
  8. 9. <ul><li>4. Cell membranes have pores (holes) in it </li></ul><ul><ul><li>Selectively permeable : Allows some molecules in and keeps other molecules out </li></ul></ul><ul><ul><li>The structure helps it be selective! </li></ul></ul>Pores
  9. 10. Outside of cell Inside of cell (cytoplasm ) Lipid Bilayer Proteins Transport Protein Phospholipids Carbohydrate chains Structure of the Cell Membrane Go to Section: Animations of membrane structure

×