click below
click below
Normal Size Small Size show me how
ch. 7 vocab (2)
| Question | Answer |
|---|---|
| cell membrane | the flexible membrane that surrounds cells. |
| cell wall | strong supporting membrane around the membrane/ |
| lipid bilayer | strong layer b/w the cell and its surroundings |
| concentration | mass of a solute in a given vol. of solution. |
| diffusion | when particles go from an area of high concentration to an area of low concentration. |
| equilibrium | when the concentration of a solute ia the same throughouta system. |
| osmosis | diffusion of water thru a selectively permeable membrane. |
| isotonic | means "same strength" |
| hypertonic | means "above strength" |
| hypotonic | means "below strength" |
| facilitated diffusion | 100s of diff protein channels have been found that allow partic. substances to cross diff. membranes. |
| active transport | transport of small molecules or ions across a cell membrane. |
| endocytosis | process of taking material into the cell by the means of infoldings or pockets. |
| phagocytosis | extensions of cytoplasm that surrounds a particle and packages it w/in a vaculoe |
| pinocytosis | tiny pockets in the cell membrane filled w water |
| exocytosis | membrane of the vaculoe surrounding the material fuses w the cell membrane |
| cell specialization | cells thru/out an organism can develop in diff ways to perform diff tasks. |
| tissues | similar cells are grouped into groups called tissues. |
| organ | many groups of tissues working together |
| organ system | group of organs working together to do a specific task. |