a tour of the cell-chapter 6

Terms	Definitions
diffusion	the net movement of particlesof a substance from where they are more concentrated to where they are less concentrated
equilibrium	balance
selectively permeable membrane	allows some substances to cross the membrane more easily than others and blocks the passage of some substances altogether
passive transport	diffusion across a membrane
facilitated diffusion	transport proteins provide a pathway for certain molecules to pass
osmosis	the passive transport of water across a selectively permeable membrane
hypertonic	the solution with a higher concentration of solute
hypotonic	the solution with the lower solute concentration
isotonic	solutions i which the concentrations of solute are equal
active transport	when a cell expends energy to move molecules or ions across a membrane
exocytosis	process of exporting proteins from a cell by a vesicle fusing wiht the plasma membrane
endocytosis	process of taking material into a cell within vesicles that bud inward from the plasma membrane
phospholipid bilayer	a "sandwich" of molecules that surrounds the organelle or cell
ATP	main energy source that cells use for most of their work
flagella	long, thin, whip-like structures wiht a core of microtubles, that enable some cells to move
microtubles	straight, hollow tubes of proteins that give rigidity, shape, and organization to a cell
microsfilaments	enable the cell to move or change shape when protein subunits slide past one another

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