Osmosis and Active Transport

• Osmosis


  The movement of water from a region of high water concentration to a region of low water concentration through a partially permeable membrane
• Osmosis experiment results


  • Strong sugar solution - Water moves out of the cell (decrease in mass)
  • Medium sugar solution - Concentration inside and outside the cell are balanced
  • Weak sugar solution - Water moves into the cell (increase in mass)
• • The more pure a solution, the more likely water will move into the cell
  • The more concentrated a solution, the more likely water will move out of the cell
• Active transport


  Uses energy from respiration to move substances against a concentration gradient
• Active transport


  • Requires energy
  • Particles move against a concentration gradient