Cell Transport

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  • Cell Transport
    • Passive Processes
      • Diffusion
        • the movement of particles from an area of high concentration to an area of low concentraion
        • Facilitated Diffusion
          • using proteins to assist large substancesto diffuse through the cell membrane
          • Carrier Proteins
            • oxygen, carbon dioxide, fatty acids
          • Protein Channels
            • sodium, potassium, calcium, chloride ions
      • Osmosis
        • the movement of a solvent (ie. water molecules) from a region of high concentration (low solute concentration) to a region of low concentration (high solute concentration) through a partially permeable membrane
        • hypertonic: a greater solute concentration
        • hypotonic: a lower solute concentration
        • isotonic: an equal solute concentration
    • Active Processes (require energy)
      • the movement of molecules against a concentration gradient
      • requires energy from respiration
      • transfer of amino acids
      • pumping sodium ions out of cells
      • Vesicular Transport
        • Endocytosis
          • the cell membrane surrounds some extracellular material with the fold of the cell membrane
          • phagocytosis: cell eating (taking in solids)
          • pinocytosis: cell drinking(taking in liquids)
        • Exocytosis
          • materials enclosed in vesicles are expelled from the cell membrane
          • eg. secretes, enzymes, hormones


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