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Exploring Cell Membrane Transport: Concepts and Challenges in Osmosis and Diffusion

Dive into the fascinating world of cell membranes and transport mechanisms with our engaging lesson! Challenge yourself to draw and label a cell membrane without notes. Learn through observation of incredible eggs, a brief PowerPoint on membrane transport, and the Gummy Bear Osmosis Lab. Discover how diffusion works, including the movement of solutes and the importance of osmosis in cells. We will also connect these concepts to real-life scenarios like Sickle Cell Anemia. Let's enhance our understanding of how substances move across cell membranes!

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Exploring Cell Membrane Transport: Concepts and Challenges in Osmosis and Diffusion

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Presentation Transcript

  1. Bell Ringer • Challenge: See if you can draw and label the cell membrane with no notes!

  2. Membrane Transport Lesson Overview: • Observe the incredible eggs • Brief PowerPoint on transport • Gummy Bear Osmosis Lab • Membrane video • Murky and Main Points

  3. Incredible Eggs

  4. Diffusion • Is a type passive transport • Is the movement of substances from an area of high concentration to low concentration • no energy required

  5. LE 7-11a Molecules Membrane (cross section) WATER Net diffusion Net diffusion Equilibrium Diffusion of one solute • Solute - a substance dissolved in another substance. Ex: dye molecules in water.

  6. LE 7-11b Net diffusion Net diffusion Equilibrium Equilibrium Net diffusion Net diffusion Diffusion of two solutes

  7. Real life connection: Sickle Cell Anemia • Oxygen diffuses in and out of normal blood cells. Can’t in abnormal shaped cells. • Estimated 100,000 Americans have sickle cell disease. • 1 in 12 African Americans have sickle cell trait. • Means that they can pass the trait to children

  8. Osmosis • Is diffusion of water across a membrane • Moves from an area of its high concentration to an area of its low conc. • Is energy required?

  9. OsmosisExample Water Water & Salt www.fmhs.uaeu.ac.ae Water Moves Water Moves until there is the same # of water molecules on each side

  10. Osmosis Terms • Hypertonic • solution with high concentration of solute • Solute – a substance dissolved in water. Ex: salt • Hypotonic • solution with low concentration of solute • Isotonic • solutions with the same solute concentration

  11. Osmosis Effects on Cells When a cell is placed in a Hypotonic solution: Cell gains water through osmosis When a cell is placed a Hypertonic solution: Cell loses water through osmosis

  12. Effects of Osmosis on Cells

  13. Video • http://youtu.be/2UPqLm-uDnI

  14. Murky and Main Points • Write 3 main points from today’s lesson. Must be content-based. • Ex: The plasma membrane is selectively permeable to control what is allowed in and out of the cell. • Write 1 or more murky points from today’s lesson. This is material that is unclear to you. • Write 1 favorite point from today’s lesson. What did you enjoy about class today?

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