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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. • Acts like a screen door: Air is allowed in, yet bugs are not. • For this reason we say that it is “Semi-Permeable” 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 are relatively more of them to an area where there are relatively fewer. • Concentration Gradient: There is an area of high concentration and an area of low concentraion. • Diffusion will stop when equilibrium is reached. 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 lose 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. (this could occur because the molecule is too large or because it is moving against the concentration gradient) – How do plant roots get their nutrients? • There is more nitrogen in the root of a plant than in the surrounding soil • Plants need more nitrogen from the soil to survive • Transport protein pulls the nutrient through the cell membrane.