| Term | Definition |
|---|
| Fluid Mosaic Model | membrane structure describes a phospholipid bilayer in which proteins can move about |
| Cell junctions | connect adjacent cells |
| Tight junctions | prevent the passage of molecules through spaces between cells nd restrict the migration of membrane proteins over the cells surface |
| Desmosomes | allow cells to adhere firmly to one another |
| Gap junctions | provide channels for communications between adjacent cells |
| Equilibrium | reached when the concentrations of the solute are identical on both sides of the membrane |
| Osmosis | water diffuses from regions of higher water concentration to regions of lower water concerntration |
| Aquaporins | membrane chnnels for waste diffusion |
| Isotonic | solute concentration on both sides of the plasma membrane are equal |
| Hypertonic | more water enters the cell than leaves it (turgor pressure) |
| hypotonic | more water leaves the cell than enters it |
| Ion channels | membrane protein that allows facilitated diffusion of ions |
| Gated ion channels | the channel can be opened or closed by certain conditions of chemicals |
| Carrier proteins | bind to polar substances and can diffuse across the membrane |
| Active Transport | requires the use of chemical energy to move substances across a membrane against a concentration gradient |
| Primary Active Transport | energy from the hydrolysis of ATP is used to move ions into or out of cells against their concentration |
| Secondary Active Transport | couples passive movement of one substance with its concentration gradient to the movement of another substances against its concentration gradient |
| Endocytosis | transport of marcromolecules, large particles and small cells into eukaryotic cells by the means of engulfment and vesicle formation from the plasma membrane |
| Receptor mediated endocytosis | specific receptor protein on the plasma membrane binds to a particular macromolecule |
| Exocytosis | materials in vesicles fuse with plasma membrane |
Combine with other sets
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