osmosis

• Osmosis


  Diffusion of water, overall movement of water molecules through a semi-permeable membrane from high concentration to low concentration
• Types of solutions

  • Diluted solutions with high concentration of water
  • Concentrated solutions with low concentration of water
• Semi-permeable membrane


  Lets some substances pass through
• Animal cell surrounded by water


  Osmosis, cell bursts
• Plant cell surrounded by high concentration solution


  Osmosis, cell becomes swollen (turgid)
• Percentage increase = (Change in value / Original value) x 100
• Animal cell in water


  Water moves into the cell by osmosis, causing the cell to expand and potentially burst
• Animal cell in concentrated solution


  Water moves out of the cell by osmosis, causing the cell to shrink
• Plant cell in concentrated solution

  Water moves out of the cell by osmosis, causing the cell to become flaccid (shrunken)
• The cell wall prevents the plant cell from bursting when water moves in by osmosis