Osmosis

• What is diffusion?


  Diffusion is the net movement of particles from an area of higher concentration to an area of lower concentration.
• How do oxygen and glucose molecules move into a cell?


  They diffuse down their concentration gradient into the cell.
• What is osmosis?


  Osmosis is the net movement of water molecules across a partially permeable membrane.
• What does the term "water concentration" refer to?


  Water concentration refers to the amount of water compared to other dissolved molecules like sugars or salts.
• What are solutes?

  Solutes are the molecules like sugars or salts that are dissolved in water.
• How does the concentration of solutes affect water concentration in a solution?


  • Higher solute concentration means lower water concentration.
  • Lower solute concentration means higher water concentration.
• If one beaker has one solute particle and another has three, which beaker has a higher solute concentration?


  The beaker with three solute particles has a higher solute concentration.
• What determines the concentration of water in a solution?


  The proportion of water compared to solutes determines the concentration of water.
• How does osmosis apply to cells?


  • Water moves from an area of higher water concentration to lower water concentration.
  • This occurs across a partially permeable membrane.
• In the example given, where is the higher water concentration located relative to the cell?


  The higher water concentration is outside the cell.
• What happens to water particles when there is a difference in water concentration between the inside and outside of a cell?


  Water particles will diffuse from the outside of the cell into the cell.