| A | B |
|---|
| Simple diffusion | Molecules or ions move from regions of higher conc towards regions of lower conc |
| Facilitated diffusion | Molecules move across the membrane through channels or by carrier molecules from a region of higher conc to one of lower conc |
| Osmosis | Water molecules move from regions of higher conc toward regions of lower conc through a selectively permeable membrane |
| Filtration | Smaller molecules are forced through porous membranes from regions of higher pressure to regions of lower pressure |
| Active transport | Carrier molecules transport molecules or ions through membranes from regions of lower conc towards regions of higher conc |
| Pinocytosis | Membranes engulf droplets of liquid from surroundings |
| Phagocytosis | Membrane engulfs solid particles from surroundings |
| Receptor-mediated endocytosis | Membrane engulfs selected molecules combined with receptor proteins |
| Exocytosis | Vesicles fuse with membrane and release contents outside of the cell |
| Transcytosis | Combines receptor-mediated endocytosis and exocytosis to ferry particles through a cell |
