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Unit 4 - Coggle Diagram

- - - - Energy is not required
      - Passive transport
      - Requires transport protein
  - - - Used when molecule is being transported against the concentration gradient (low-high)
        
        Requires energy
  - - - No energy
        
        Passive transport
      - Moves with concentration gradient
- - - - Phagocytosis - Pseudopods stretch around molecule and pulls it into a vacuole
      - Recepter-mediated Endocytosis - susbtance has to bind to receptors to get in
      - Pinocytosis - allies cells to take in fluids
      - Exocytosis - Process by which a cell releases large amounts of material(reverse endooysytosis
      - Used to get rid of cell waste and material made by cell
      - cells absorb external material by engulfing it with the cell membrane.
- - - - 3 ways molecules enter the cell
    - - Phospholipid bilayer - main component + barrier
        
        Proteins
        
        Minor component
        
        lets molecules in and out of cell so the cell can maintain its internal environment and metabolize
        
        displaying specific molecules so that the cell can sense and respond to its environment
        
        interacting with specific signals from the environment and transmitting these signals to the interior of the cell, again so the cell can sense and respond to its environment
        
        semi-permeable / selectively permeable - membranes that allow some substances through but not others