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Understanding Cell Transport Processes: Diffusion, Osmosis, and More

Explore the movement of materials in and out of cells through diffusion, osmosis, and active transport. Learn about selectively permeable membranes, cell wall functions, and the impact of tonicity on plant and animal cells.

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Understanding Cell Transport Processes: Diffusion, Osmosis, and More

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  1. The movement of materials in and out of a cell

  2. Two types of transport

  3. Selectively Permeable Membrane- [like a strainer] - contains different size openings called pores - only materials smallerthan openings pass through

  4. Diffusion- Movement of molecules from an area where there are many to an area where there are few Examples:food coloring in water, spraying air freshener Simple Rule: HIGH TO LOW IS THE FLOW CONTINUES UNTIL ……. Equilibrium/Homeostasis- molecules are equally distributed in an area

  5. Osmosis- movement of WATER molecules from an area where there are many to an area where there are few

  6. Which way will molecules move?What process is it? 10% Water Time 100% Water Osmosis High sugar Time Low Sugar Diffusion

  7. Osmosis can effect plant and animal cells differently • Can you think of which cell organelle that a plant has which an animal cell does not, that may have something to do with this? • The Cell Wall!!

  8. Plant Cells Fresh Water Salt Water Cell Membrane Plasmolysis-cell membrane shrinking away from cell wall, due to water exiting cell Why? Salt is a substance that will draw water in its direction. This is why you feel thirsty when you eat something salty. Simple Rule: Salt Sucks

  9. Plant Cells HYPER= more TONIC = solution HYPO = less TONIC = solution HYPOTONIC CELL HYPERTONIC CELL 100% H2O 90% H2O 10% NaCl 97% H2O 97% H2O Water moves out of cell, Cell membrane pulls away from cell wall Water rushes into cell, keeps cell rigid PLASMOLYSIS

  10. Animal Cells HYPOTONIC CELL HYPERTONIC CELL 95% H2O 100% H2O 90% H2O 100% H2O - Water rushes into cell - Cell swells and may burst due to lack of cell wall • - Water rushes out of cell • Cell shrinks due to lack of cell wall

  11. ISO = same TONIC = solution ISOTONIC CELL 97% H2O 97% H2O • Cell does not change, water equal inside and out • Equilibrium/Homeostasis

  12. Active Transport – requires energy Endocytosis- process used by cells to transport large materials [proteins] INTO cell Greek terms : ENDO = inside CYTOSIS = relates to cell

  13. Exocytosis- process used by cell to move wastes or other materials OUT of cell Greek terms : EXO = outside CYTOSIS = relates to cell

  14. What do you know? • What are the 2 general types of cell transport and what is the difference between them? • How does a selectively permeable membrane work? • What is diffusion? • What is osmosis and how is it different in plant and animal cells? • What is the difference between hypertonic, hypotonic, and isotonic cells? • What are the 2 types of active transport and how do they work?

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