The Cell Membrane
Phospholipid
Phospholipids…. <ul><li>The phospholipid is the primary component of the cell membrane.  </li></ul><ul><li>It is made up o...
Lipid bilayer   <ul><li>The structure of a bilayer explains its function as a barrier.  </li></ul><ul><li>Lipids  are  amp...
Lipid bilayer   <ul><li>The bilayer is composed of two layers of lipids arranged so that their  hydrocarbon  tails face on...
Channel Proteins   A passageway for molecules to move via diffusion. Requires no energy.
Receptor Proteins   <ul><li>Protein molecule embedded in the cell membrane to which a ligand can attach to. </li></ul><ul>...
 
Marker Proteins <ul><li>Marker proteins extend across the cell membrane and serve to identify the cell.  </li></ul>
Marker Proteins…. <ul><li>The immune system uses these proteins to tell friendly cells from foreign invaders.  </li></ul><...
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The Cell Membrane

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The Cell Membrane

  1. 1. The Cell Membrane
  2. 2. Phospholipid
  3. 3. Phospholipids…. <ul><li>The phospholipid is the primary component of the cell membrane. </li></ul><ul><li>It is made up of a head and two tails. </li></ul><ul><li>The head is hydrophilic which means it likes water </li></ul><ul><li>The tails are hydrophobic which means they repel water. </li></ul>
  4. 4. Lipid bilayer <ul><li>The structure of a bilayer explains its function as a barrier. </li></ul><ul><li>Lipids are amphiphilic molecules since they consist of polar head groups and non-polar fatty acid tails. </li></ul>
  5. 5. Lipid bilayer <ul><li>The bilayer is composed of two layers of lipids arranged so that their hydrocarbon tails face one another to form an oily core held together by the hydrophobic effect , while their charged heads face the aqueous solutions on either side of the membrane. </li></ul>
  6. 6. Channel Proteins A passageway for molecules to move via diffusion. Requires no energy.
  7. 7. Receptor Proteins <ul><li>Protein molecule embedded in the cell membrane to which a ligand can attach to. </li></ul><ul><li>A molecule which binds to a receptor is called a &quot; ligand ,&quot; and may be a peptide (such as a neurotransmitter ), a hormone , a pharmaceutical drug, or a toxin, and when such binding occurs, the receptor ordinarily initiates a cellular response. </li></ul>
  8. 9. Marker Proteins <ul><li>Marker proteins extend across the cell membrane and serve to identify the cell. </li></ul>
  9. 10. Marker Proteins…. <ul><li>The immune system uses these proteins to tell friendly cells from foreign invaders. </li></ul><ul><li>They are as unique as fingerprints. </li></ul><ul><li>They play an important role in organ transplants. </li></ul><ul><li>If the marker proteins on a transplanted organ are different from those of the original organ the body will reject it as a foreign invader. </li></ul>

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