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Cellular Transport - PowerPoint PPT Presentation


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Cellular Transport. Passive Transport. When a cell moves particles across its membrane without using energy. Either by Simple Diffusion Or by Facilitated Diffusion http://www.youtube.com/watch?v=kfy92hdaAH0&feature=related&safety_mode=true&persist_safety_mode=1. Facilitated Diffusion .

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passive transport
Passive Transport
  • When a cell moves particles across its membrane without using energy.
  • Either by Simple Diffusion
  • Or by Facilitated Diffusion
  • http://www.youtube.com/watch?v=kfy92hdaAH0&feature=related&safety_mode=true&persist_safety_mode=1
facilitated diffusion
Facilitated Diffusion
  • Is the passive transport of materials across the membrane using transport proteins
  • Moves materials along the concentration gradient
  • http://phet.colorado.edu/en/simulation/membrane-channels
facilitated diffusion1
Facilitated Diffusion
  • Channel Proteins
    • Form channels in proteins that allow specific molecules to flow through
  • Carrier Proteins
    • These proteins change shape to allow specific substances to move through
active transport
Active Transport
  • The movement of materials through a membrane AGAINST a concentration gradient
  • Any movement of molecules inside/outside of a cell

that requires ATP

  • Requires Energy!!!
active transport1
Active Transport
  • Only carrier proteins
    • 1. Substance to be moved binds to transport protein
    • 2. Protein uses energy (ATP) to change its shape
    • 3. Substance unbinds and is released
endocytosis
Endocytosis
  • The Process by which cells surrounds and takes in material from its environment
  • Takes in a lot and requires a lot of energy
  • http://www.youtube.com/watch?v=K7yku3sa4Y8&feature=related&safety_mode=true&persist_safety_mode=1
exocytosis
Exocytosis
  • Is the expulsion of materials from a cell.
  • Moves a lot and requires a lot of energy
cell size
Cell Size
  • Why aren’t cells large?
    • There are 3 specific reasons
reason 1
Reason 1
  • Diffusion
    • Is fast and efficient over short distances only
reason 2
Reason 2
  • DNA
    • The amount of DNA only allows for so many proteins to be made at a time
reason 3
Reason 3
  • Surface area to volume ratio
    • Surface area increases slower than volume as the cell grows