Osmosis

• What is diffusion?

  Net movement of particles from high to low concentration
• How do oxygen and glucose molecules move into a cell?

  By diffusing down their concentration gradient
• What is osmosis?

  Diffusion of water molecules across a membrane
• What does the term "water concentration" refer to?

  Amount of water compared to dissolved solutes
• How does the concentration of solutes affect water concentration?

  Higher solute concentration means lower water concentration
• What happens when comparing two beakers with different solute concentrations?

  • Beaker with more solute has lower water concentration
  • Beaker with less solute has higher water concentration
  • Concentration is based on proportion, not volume
• What is the effect of a higher water concentration outside a cell?

  Water will diffuse into the cell
• What is the role of the cell's partially permeable membrane in osmosis?

  It allows water to move but not solutes
• What is the concentration gradient in osmosis?

  Movement from higher to lower water concentration
• How does osmosis apply to cells?

  • Water moves from high to low concentration
  • Affects cell volume and pressure
  • Important for maintaining cell homeostasis