13 terms

Biology 3.4 and 3.5 Diffusion and Osmosis/active transport

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passive transport
movement of molecules across a cell membrane without energy input from the cell
diffusion
the movement of molecules in a liquid or a gas from a region of high concentration to a region of lower concentration
concentration gradient
the difference in concentration of a substance from one location to another. Molecules diffuse DOWN this
osmosis
water molecules moving across a semipermeable membrane from an area of high concentration to an area of lower concentration
isotonic solution
has same concentration of solute as the cell
hypertonic solution
has higher concentration of solute than the cell
hypotonic solution
has lower concentration of solute than the cell
facilitated diffusion
the diffusion of molecules across a membrane through transport proteins-a type of passive transport
active transport
drives molecules across a membrane from a region of lower concentration to a region of higher concentration-requires energy
endocytosis
the process of taking liquids or fairly large molecules into the cell by engulfing them in a membrane
phagocytosis
a type of endocytosis in which cell membrane engulfs large particles
exocytosis
the opposite of endocytosis; the release of substances out of a cell by the fusion of a vesicle with the membrane
pinocytosis
cell drinking