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Cell Membrane
Cell Membrane
Cell Membrane
Cell Membrane
Cell Membrane
Cell Membrane
Cell Membrane
Cell Membrane
Cell Membrane
Cell Membrane
Cell Membrane
Cell Membrane
Cell Membrane
Cell Membrane
Cell Membrane
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Cell Membrane

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  1. Cell Membrane and Transport Ariel Sacco Ashlee Heidgerd Sidney Hardie
  2. Cell Membrane <ul><li>It is composed of lipids, proteins, and carbohydrates. </li></ul><ul><li>It is a bilayer of phospholipids molecules. </li></ul><ul><li>The water soluble phosphates are the heads on the membrane. </li></ul><ul><li>The water insoluble fatty acids are the tails inside the membrane. </li></ul><ul><li>Proteins function as receptors on the surface and form passageways for ions and molecules. </li></ul><ul><li>It is the outermost layer of the cell. </li></ul>
  3. Fluid Mosaic Membrane Model Hydrophobic Region Hydrophilic Region Carbohydrate Side Chain Glycoprotein Integral Protein Phospholipid Hydrophobic Region Hydrophilic Region Transmembrane Protein
  4. Diffusion <ul><li>In the body, diffusion exchanges oxygen and carbon dioxide. </li></ul><ul><li>It’s the movement of molecules of ions from higher concentration to lower concentration </li></ul>
  5.  
  6. Facilitated Diffusion <ul><li>Special carrier molecules move substances through the membrane. </li></ul><ul><li>It moves substances from higher concentration to lower concentration </li></ul>
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  8. Osmosis <ul><li>The diffusion of water molecules from higher water concentration to lower water concentration through a permeable membrane. </li></ul><ul><li>The osmotic pressure increases as the number of particles are dissolved. </li></ul><ul><li>Cells lose water when in hypertonic solutions and gain water in hypotonic solutions. </li></ul>
  9.  
  10. <ul><li>The Na K pump is an example of endocytosis and exocytosis because during this process potassium ions are diffusing out of the cell and the sodium ions are diffusing in to the cell. </li></ul>PUMP
  11.  
  12. Endocytosis <ul><li>It conveys relatively large particles into a cell. </li></ul><ul><li>It occurs in three forms which are pinocytosis, phagocytosis, receptor mediated endocytosis. </li></ul><ul><ul><li>Pinocytosis – cells take in tiny droplets of liquid from their surroundings </li></ul></ul><ul><ul><li>Phagocytosis – the cell takes in solids from their surroundings </li></ul></ul><ul><ul><li>Receptor mediated endocytosis – protein molecules are drawn into the cell by receptors </li></ul></ul>
  13.  
  14. Exocytosis <ul><li>It releases substances that were stored in the cell. </li></ul><ul><li>Transcytosis – it combines endocytosis and exocytosis to transport a particle across the cell. </li></ul>
  15. The End

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