Active Transport

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Active Transport

  1. 1. No BellRinger This Week<br />
  2. 2. Agenda<br />NOTES: Active Transport<br />Simple & Facilitated Diffusion<br />Protein Pumps<br />Endocytosis & Exocytosis<br />Osmosis Practice Problems (Friday Lab)<br />
  3. 3. Passive Transport<br />“Passive Transport” means that the cell can move molecules in and out of the cell without using energy<br />Passive transport relies on diffusion that naturally moves substances from high to low concentration<br />There are 2 types of diffusion:<br />Simple Diffusion<br />Facilitated Diffusion<br />
  4. 4. Simple Diffusion<br />In simple diffusion, molecules pass directly through the membrane by slipping between phospholipids<br />Simple diffusion is possible under 2 conditions:<br />The molecule is small<br />The molecule has no electric charge<br />
  5. 5. Ions<br />An ion is an atom or molecule that carries an electric charge. Ions may be either + or - .<br />Ions can’t pass through a membrane because the non-polar “tails” repel charges.<br />Salt is Ionic:<br />Salt is made of Sodium [Na] and Chlorine [Cl]. When salt dissolves in water the Sodium becomes positive and the chlorine becomes negative. <br />
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  8. 8. Facilitated Diffusion<br />Large molecules and ions can diffuse in and out of the cell by going through protein channels (tunnels).<br />Each protein channel is shaped to work for only one specific molecule. <br />
  9. 9. passive transport<br />
  10. 10. Active Transport<br />In Active Transport, the cell uses energy to move substances through the membrane.<br />This energy comes in the form of ATP molecules that are produced by mitochondria breaking down food.<br />There are 3 types of active transport:<br />Protein Pumps<br />Endocytosis<br />Exocytosis<br />
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  12. 12. Protein Pumps<br />Protein Pumps use ATP energy to change their shape and force molecules in or out of the cell.<br />Protein pumps can work against the direction of diffusion, allowing cells to maintain high concentrations of important substances. <br />
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  14. 14. Endocytosis<br />Endocytosis brings a large number of molecules into the cell.<br />Endocytosis begins with the membrane bulging inward to create a small pocket.<br />The pocket pinches inward and forms a bubble (vesicle) inside of the cell.<br />
  15. 15. Exocytosis<br />Exocytosis removes a number of molecules from the cell.<br />During exocytosis, a tiny bubble (vesicle) will join to the membrane and release the substances it carries to the outside. <br />
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  19. 19. BrainPOP: Active Transport<br />

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