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Unit 4 Biology
Biology Unit 4 Vocabulary
| Term | Definition |
|---|---|
| Active Transport | Movement of substances through the cell membrane that REQUIRES ENERGY. Moving things from a LOW concentration to a HIGH concentration. |
| Passive Transport | Movement of substances through a cell membrane DOES NOT require energy (diffusion and osmosis) |
| Cell Membrane | A flexible boundary that controls the movement of substances into and out of the cell |
| Diffusion | Movement of molecules from an area of HIGH concentration to an area of LOW concentration. |
| Homeostasis | Process by which organisms maintain a relatively stable internal environment. |
| Selective Permeable | A property of cell membranes that allows some substances to pass through, while others cannot. |
| Osmosis | Diffusion of WATER molecules through a semi-permeable membrane from HIGH concentration to LOW concentration. |
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