types of transport - ms. schmidly's...
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Types of Transport
Learning Target:Contrast active and passive transport.
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Recall:What is the structure of the plasma membrane and what are some of its characteristics?
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What are the characteristics of the plasma membrane?1. Fluid Mosaic Model: describes how the
parts of the membrane are not stuck in place, but have the ability to move around.
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What are the characteristics of the plasma membrane?2. Semi-permeable: describes a membrane
that only allows SOME molecules to pass.
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Important Vocabulary Concentration Gradient: When the amount of substances (concentration) is different in two places. Equilibrium: When the amount of substances (concentration) is the SAME in both places.
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What is passive transport?
● Describes the transport of molecules across the plasma membrane.
● Molecules are in constant, random motion.○ Move from high concentration to low concentration. ○ Occurs naturally, so it does NOT require energy.
● Diffusion, osmosis, or facilitated diffusion.
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What is active transport?
● Requires energy.● Molecules move from a region of low
concentration to high concentration. ● This does not occur naturally, so the cell has
to use energy (ATP).
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