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Transcript
Passive Vs. Active Transport in Cells What is passive transport? • Questions: What part of a cell allows things like sugar, water, and salt in and out of its environment. • Cell Membrane • Passive Transport: The movement of substances through the cell membrane without the input of energy (force). • Acts like a screen door: Air is allowed in, yet bugs are not. • Small particles do not require force. What is diffusion? • What takes place in your body when a coach ask you to “warm up”? • The oxygen you are taking in is being passed to all the cells in your body. • What allows this process to take place? • Diffusion: A type of passive transport where molecules move from an area where there is relatively more of them to an area where there is relatively less. • Diffusion will stop when equilibrium is reached. • Why do you pull muscles when you don’t warm-up? • The muscle that you hurt did not receive enough oxygen filled cells. How does temperature effect diffusion? • Mini-lab – Conclusion: Heat increases the rate of diffusion. What is osmosis? • Osmosis: The diffusion of water through a cell membrane. • Water will leave a cell when there is not the same amount of water inside and outside the cell. • When plant cells loose water the cell membrane pulls away from the cell wall. – Why do plants become limp in the summer time? What is active transport? • Active Transport: When an input of energy is required to move materials through a cell membrane. – How do plant roots get their nutrients? • Transport protein pulls the nutrient through the cell membrane. Diffusion/Osmosis Interactive Lab • http://mw.concord.org/modeler1.3/mirror/c hemistry/diffusion.html EOG Test Prep • • Passive vs. Active Transport Review: http://glencoe.mcgrawhill.com/sites/0078617898/student_view0/unit5/chapter17/section_2_self-check_quizeng_.html Cell Process EOG Questions: http://glencoe.mcgrawhill.com/sites/0078617898/student_view0/unit5/chapter17/standardized_test_practice. html