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chapter 2 lesson 4
cell book connor ballew
| Term | Definition |
|---|---|
| selectively permeable | selectively permeable in a cell is when the membrane allows some materials and substances but not all. |
| passive transport | passive transport is when materials and substances are moved on and into a cell membrane with no use of energy. |
| diffusion | diffusion is the movement of molecules from higher to lower concentration. one of three ways substances can move on and into the cell membrane. |
| osmosis | osmosis is the spread of water molecules through a selectively permeable membrane. |
| active transport | active transport is when cellular energy is used to move materials through a cell membrane. |
| how materials move in and out of a cell | Materials move in and out of a cell primarily through processes called diffusion, osmosis, and active transport. |
| different types of membrane transport and how each works | passive transport and active transport. Passive transport occurs without energy and includes diffusion (movement from high to low concentration). Active transport requires energy to move molecules against their concentration gradient |
| the difference between facilitated diffusion and diffusion | Facilitated diffusion is a type of passive transport that requires specific proteins to help larger molecules cross the cell membrane, while simple diffusion allows small, non-polar molecules to move directly through the membrane without assistance |
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