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Cell Processes: Understanding Diffusion, Osmosis, and Transport

Explore how cells selectively permeate and transport substances, with hands-on activities and demos to facilitate learning in a fun way. Understand concepts like diffusion and active transport in this interactive lesson.

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Cell Processes: Understanding Diffusion, Osmosis, and Transport

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  1. Cell Processes 1

  2. GET OUT HOMEWORK • Do Now: How can you smell perfume that someone sprays from across the room???? Brainstorm!! • Homework: Activity sheet (TBD…) windows Door

  3. DEMO!

  4. Terms Review • Selectively Permeable – will only allow certain things to pass through it • Permeable – means things can pass • Selective – not everything • The cell membrane is selectively permeable to molecules • “Semi-permeable” • Sometimes the membrane will allow “other” molecules to pass, other times it will only allow water molecules to pass.

  5. Terms Review • Solvent vs. Solute • Kool-Aid • Solvent = • Solute = • Iced Tea • Solvent = • Solute = Water Sugar Water Tea

  6. Solute and Solvent?? • Hypertonic – high concentration of solute • When you’re hyper, you have more energy!! • Hypotonic – low concentration of solute • Isotonic – same concentration of solutes (when comparing two solutions) • Hypertonic solution means more solute in the solution than in the cell

  7. DIFFUSION: Movement of molecules of any substance from ahighconcentration to alowconcentration. WHAT DOES THAT MEAN? This can happen in the open air, or through a selectively permeable membrane!!

  8. How? • Molecules are always moving and bumping into each other • More molecules = more collisions • Collisions push the molecules away from each other slowly

  9. Molecules like their own space. If there are too many in one space then molecules will move to a place with less stuff (less molecules). DOES NOT NEED ENERGY TO MOVE! SPREAD OUT HIGH CONCENTRATION

  10. HOW DIFFUSION WORKS

  11. Molecules move in and out of the cell through the cell membrane Draw arrows to show which way the molecules will move

  12. Where do you observe this? • Helium balloons • Perfume/cologne • Cigarette smoke • Cooking pasta

  13. OSMOSIS The movement of water through a membrane DOES NOT NEED ENERGY TO MOVE!

  14. How do you dilute something?? • There is way too much sugar powder in your drink after you make Kool-Aid. • How do you fix this? • 1. Try to remove the solute (difficult) • 2. Add more solvent! (water)

  15. What are the consequences to a cell if too much water goes…? • INTO THE CELL • OUT OF THE CELL SHRINKS BLOATS

  16. Isotonic Hypertonic Hypotonic

  17. ACTIVE TRANSPORT NEEDS ENERGY to “move” substances across the membrane • USUALLY MOVES SUBSTANCES FROM A LOW CONCENTRATION • TO A HIGH CONCENTRATION

  18. How? • Transport proteins – Think back to chemicals of life • “Proteins make up some cell parts” • Transport proteins allow active transport to happen!

  19. Active Transport • Brain Pop Video • https://www.brainpop.com/science/cellularlifeandgenetics/activetransport/

  20. PASSIVE TRANSPORT DON’T NEED ENERGY to “move” substances across the membrane • USUALLY MOVES SUBSTANCES FROM A HIGH CONCENTRATION • TO A LOW CONCENTRATION

  21. Question: • Which of the following statements concerning diffusion and active transport is correct? • Both diffusion and active transport require cell energy. • Neither diffusion nor active transport require cell energy. • Diffusion requires cell energy while active transport does not. • Active transport requires cell energy while diffusion does not.

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