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Understanding Diffusion and Osmosis in Cell Transport

Explore the concepts of diffusion, solutes, solvents, concentration, and transport in cells. Learn about passive and active transport, osmosis, and examples of diffusion. Understand how water moves and its role in cellular processes. Get ready for an exciting Egg Lab tomorrow!

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Understanding Diffusion and Osmosis in Cell Transport

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  1. Drill 1.3.11 • 1- What is diffusion? • 2- What is the difference between a solute and solvent? • 3- 50 g of sodium chloride is dissolved in water. Identify the solute and the solvent. • 4- How is concentration related to the way a solute moves? That is, in what direction does a solute move?

  2. Moving Moving Molecules! • Passive transport = NO ENERGY • Molecules are moving from _______ concentration to _______ concentration • Active transport = NEEDS ENERGY • Molecules are moving from _______ concentration to _______ concentration

  3. Passive Transport • No energy!!!! • Diffusion = MOVEMENT OF SOLUTE • Osmosis = MOVEMENT OF WATER

  4. Diffusion • Movement of solute from ______ to ______ concentration • At what point does diffusion stop?

  5. Examples of diffusion • Perfume • Making tea • Someone smoking a cigarette • How might diffusion explain why a helium balloon deflates slowly over time?

  6. Simple and Facilitated Diffusion

  7. Osmosis • Movement of water from ______ concentration to ______ concentration • This is different from diffusion! How?

  8. Let’s think about this • Osmosis involves the movement of water • **across a semi-permeable membrane** • Water moves from high to low water concentration • Moves from low to high solute concentration

  9. Examples of osmosis • Why your lips dry out when you eat salty foods! • Plants (and plant cells) becoming rigid • How your kidneys work! • Water intoxication syndrome (not good)

  10. 1. Animal cell 2. Animal cell 3. Animal cells 4. Plant cell

  11. Red blood cells and Osmosis

  12. Homework • Passive transport worksheet • Know the difference between solute and solvent • Describe how solutes move • Know the difference between simple diffusion and facilitated diffusion • Know the difference between diffusion and osmosis • Describe how water moves

  13. Tomorrow: Egg lab!! • 4 days of observations and fun!

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