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Transcript
Chapter Four Section One Cell Transportation Think!! How is a cell like a space station? 1. How is the cell 1. It is selectively membrane like a permeable. gatekeeper. Allows some things to pass through; not others 2. Materials can move in and out of a cell two ways. 2. Passive Transport –Diffusion -Osmosis Active Transport -Endocytosis -Exocytosis 3. What is Passive Transport? 3. Movement of materials through cell membrane WITHOUT using energy. 3. 3. Like bicycling downhill. Diffusion and Osmosis are forms of passive transport 4. What is Diffusion? 4. SMALL Molecules move from a crowded area to a less crowded area. Pencils Down! Dye diffuses from a crowded (concentrated area) to a less concentrated area. Ch 4 Fig 1. Ch 4 Figure 2 100 % water 60 % water 5. Why does diffusion happen? 5. Molecules always moving More Molecules More Collisions More Pushing Away from each other •Small particles •Crowded to less crowded •NO energy required 6. How do singlecelled organisms get oxygen inside? 6. More oxygen in water than inside cell. Ch 4 Fig. 3 7. What is Osmosis? 7. Diffusion of water across a cell membrane. 8. Why is osmosis important to cells? 8. Cells need water to function. Think Why can some fish live only in fresh water and some live only in saltwater? Think Different adaptations. 9. What is Active Transport? 9. Move materials through cell membrane using energy. From less crowded area to more crowded area. 9. What is Active Transport? 9. Like pedaling UP HILL! 10. How does active transport happen? 2 ways: 10. FOR SMALL PARTICLES: Transport proteins pick up a molecule and carry it across the membrane. Ch 4 Fig 3 •Small particles •Less crowded to more crowded •ENERGY required Chapter 4 Figure 3 10. How does active transport happen? 2 ways: 10. FOR LARGE PARTICLES: Endocytosis: membrane surrounds molecule and pinched off into vacuole. Ch 4 Fig 4 Chapter 4 Figure 4 10. How does active transport happen? 2 ways: 10. FOR LARGE PARTICLES: Exocytosis: vesicle carries particles to cell membrane to release Ch 4 Fig 5 11. Why are cells so small? 11. If too large, it’s hard to move material in and out of the cell. It is too far from the membrane. Exit Slip • Create a simple Venn Diagram to compare active and passive transport. Exit Slip • A single-celled organism is transferred from a tank of fresh water into a tank of salt water. How will the cell change? Explain.