2.12 Definitions of diffusion, osmosis and active transport

Recall simple definitions of diffusion, osmosis and active transport
  • These are the three ways that substances move in or out of cells
  • Diffusion is when molecules move from a regent of their high concentration to a regent of their low concentration
  • Osmosis is the movement of water
  • The rule of osmosis is water will move form dilute solution to the concentration solution through a membrane
  • Active transport occurs when special carrir proteins on the surface of a cell pick up particles from one side of the membrane and the transport them to the other side.
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