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Gr. 7 Science--Book C, Ch. 1, Section 4: The Cell in its Environment
Key Terms and Definitions
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| selectively permeable | a property of cell membranes that allows some substances to pass through, while others cannot |
| diffusion | the process by which molecules move from an area of higher concentration to an area of lower concentration |
| active transport | the movement of materials through a cell membrane using energy |
| passive transport | the movement of materials through a cell membrane WITHOUT using energy |
| osmosis | the diffusion of water molecules through a selectively permeable membrane |
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Speech-Language Pathologist |
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