 | Term | Definition |
| |
Structure of the Lipid Bilayer |
composition of nearly all cell membranes as a double-layered sheet; 2 layers of lipids gives membranes a flexible structure that forms a strong barrier between the cell & its surroundings |
| |
Diffusion |
process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated |
| |
Osmosis |
diffusion of water through a selectively permeable membrane |
| |
Facilitated Diffusion |
movement of specific molecules across cell membranes through protein channels |
| |
Isotonic |
when the concentration of 2 solutions is the same |
| |
Hypertonic |
when comparing2 solutions, the solution with the greater concentration of solutes |
| |
Hypotonic |
when comparing 2 solutions, the solution with the lesser concentration of solutes |
| |
Active Transport |
energy requiring process that moves material across a cell membrane against a concentration difference |
| |
Endocytosis |
process by which a cell takes material into the cell by infolding of the cell membrane |
| |
Phagocytosis |
process by which extensions of cytoplasm surround & engulf large particles & take them into the cell |
| |
Pinocytosis |
process by which a cell takes in liquid from the surrounding environment |
| |
Exocytosis |
process by which a cell releases large amounts of material |
