Osmosis

• What is diffusion?

  The net movement of particles from an area of higher concentration to an area of lower concentration
• How does diffusion work when oxygen or glucose enter a cell?

  Oxygen or glucose molecules diffuse down their concentration gradient into the cell
• What is osmosis?

  The net movement of water molecules across a partially permeable membrane from a region of higher water concentration to a region of lower water concentration
• How is water concentration determined in solutions?

  • Water concentration is the proportion of water compared to solutes
  • It's the amount of water relative to the other molecules dissolved in it
  • Solutes are the dissolving molecules like sugars or salts
• What determines the water concentration in a beaker?

  The proportion of water compared to solutes
• In which region would water move by osmosis if one side of a membrane contains pure water and the other side contains a high solute concentration?

  Water moves from the side with pure water to the side with high solute concentration
• How does osmosis apply to cells?

  • Water moves across the partially permeable cell membrane
  • Moves from an area of higher water concentration outside the cell to lower inside
  • This process is known as osmosis
  • Water diffuses down its concentration gradient