click below
click below
Normal Size Small Size show me how
chapter 3 terms
biology chapter 3.4-3.5 cell terms
Question | Answer |
---|---|
passive transport | movement of molecules across the cell membrane without energy input from the cell |
diffusion | movement of dissolved molecules in a fluid or gas form a region of higher concentration to a region of lower concentration |
concentration gradient | difference in the concentration of a substance from one location to another |
osmosis | diffusion of water molecules across a semipermeable membrane from an area of higher water concentration to an area of lower water concentration |
isotonic | solution that has an equal concentration of dissolved particles compared with another solution |
hypertonic | solution that has a higher concentration of dissolved particles compared with another solution |
hypotonic | solution that has a higher concentration of dissolved particles compared with another solution |
facilitated diffusion | diffusion of molecules assisted by protein channels that pierce a cell membrane |
active transport | energy-requiring movement of molecules across a membrane from a region of lower concentration to a region of higher concentration |
endocytosis | uptake of liquids or large molecules into a cell by inward folding of the cell membrane |
phagocytosis | uptake of a solid particle into a cell by engulfing the particle |
exocytosis | release of substances out of a cell by the fusion of a vesicle with the membrane |