Why Organisms Need Transport Systems
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Why Organisms Need Transport Systems
Year 9 Science Understanding biological systems and processes
Think About This...
Why can't a human survive by just letting oxygen drift around their body like a single-celled organism does? What's the difference between how a bacteria gets nutrients versus how you do?
What is Diffusion?
Movement of particles from high concentration to low concentration Happens naturally - no energy required Works well over SHORT distances Examples: oxygen entering cells, perfume spreading in a room
Diffusion in Action
Surface Area to Volume Investigation
Work in groups of 3-4 Use clay cubes of different sizes Calculate surface area and volume Determine SA:V ratios Discuss: How does size affect diffusion efficiency?
Single Cell vs Multicellular Organisms
{"left":"Single cells: Small size, diffusion works well, all parts close to surface, no transport system needed","right":"Multicellular organisms: Large size, diffusion too slow, internal cells far from surface, specialized transport systems essential"}
Why We Need Specialized Transport Systems
Diffusion alone is too slow for large organisms Internal cells would die waiting for nutrients Waste products need quick removal Examples: circulatory system, respiratory system, digestive system
Key Takeaway
"The larger and more complex an organism becomes, the more it depends on specialized transport systems to survive."