B2.5 Osmosis

• What is the focus of today's video?

  Understanding osmosis and water concentration
• What is diffusion?

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

  By diffusing down their concentration gradient
• What is osmosis?

  Diffusion of water molecules across a membrane
• What defines the term "water concentration"?

  Amount of water compared to dissolved solutes
• What do we call the molecules dissolved in water?

  Solutes
• How does solute concentration affect water concentration?

  • 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 has higher solute concentration?

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

  The proportion of water compared to solutes
• How does osmosis apply to cells?

  • Water moves from higher to lower water concentration
  • Occurs across a partially permeable membrane
  • Affects cell volume and pressure
• What happens to water particles due to the concentration difference?

  They diffuse into the cell
• What is the process of water moving into the cell called?

  Osmosis
• What resources are available for further learning?

  • Learning platform with videos
  • Practice questions
  • Progress tracking
• What can viewers do to access more content related to this video?

  Check the playlist and links in the description
• Osmosis is 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.
• In living organisms, the partially permeable membrane is usually the ___________.

  Cell membrane
• Osmosis is the movement of which molecules?

  Water
• What would happen to red blood cells if they were placed in pure water?

  • They would gain water and swell
  • If placed in pure water, then the water concentration would be higher outside the cell (in the pure water) than inside the cell. This means that water would move down its concentration gradient into the cell, causing it to swell and possibly burst