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  • Cell Transport By: Olivia G.
  • Well, the bus ride would've been active transport, which is when extra energy is required.
  • That bus ride reminded me of how cells use active and passive transport to move stuff.
  • And passive is defined as transport that does not require extra energy input.
  • How??
  • Oh, okay.
  • Osmosis is the movement of water through the cell membrane based on solute concentration.
  • Yeah,  and then there's osmosis.
  • Oh, that's cool!! What else is there?
  • What's that?
  • With diffusion,  if it can pass through easily, it's simple and if it requires the use of a membrane protein, it's facilitated.
  • There's diffusion, which is when the substance moving is a molecule.
  • And in active transport, you have protein pumps for ions, and endo & exocytosis for large molecules.
  • What is the difference between endocytosis & exocytosis?
  • Endocytosis is when it's moving into the cell and exocytosis is when its moving...
  • Correct! 
  • Out of the cell!!!
  • Yes. If the solution in the cell is less concentrated than the outside environment, then it is considered hypertonic. The water will move into the cell. 
  •  if the solution in the cell is more concentrated than the outside environment, it's hypotonic, which means the water will move out of the cell
  • Is there anything that affects how osmosis works?
  • Thanks!!
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