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Chapter 7.4

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Term
Definition
Diffusion   The random movement of particles from high concentration to low concentration  
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Dynamic equlibrium   Continuous movement but no overall change.  
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Facilitated diffusion   Uses transport proteins to move other ions and small molecules across the cell membrane.  
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osmosis   The diffusion of water across a selectively permeable membrane.  
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Isotonic Solution   When a cell is in a solution that has the same concentration of water and solutes as the cytoplasm  
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Hypotonic Solution   If a cell is in a solution that has a lower concentration of solute  
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Hypertonic solution   The concentration of the solute outside of the cell is higher than the inside.  
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Active transport   The movement of substances across the plasma membrane against a concentration gradient: requires energy  
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Endocytosis   The process by which a cell surrounds a substance in the outside environment, enclosing the substance in a portion of the cell membrane.  
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Exocytosis   The secretion of materials at the cell membrane  
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