2.13a Diffusion in cells

Understand that movement of substances into and out of cells can be by diffusion, osmosis and active transport
  • Diffusion is a movement of molecules of high concentration to a regent of a low concentration 
  • Movement of molecules is passive - so you don't add energy
  • An example of diffusion is movement of oxygen in to a respiring animal cell 
  • The same cell can carry out respiration, producing a high concentration of carbon dioxide inside the cell diffusing into a low concentration outside the cell

About