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Lesson 4 green book
Lesson 4 notecards green book
| Term | Definition |
|---|---|
| Selectively permeable | A barrier like a cell membrane lets some molecules pass while blocking others to maintain balance |
| Passive transport | a type of membrane transport that does not need energy to move substances across cell membranes. |
| Diffusion | happens with small molecules. the movement of anything like atoms, ions, molecules generally from a region of higher concentration to a region of lower concentration. |
| Osmosis | Water to cell High to low to balance the level on both sides |
| Active transport | The cells energy requiring process to move across a cell membrane against their concentration from Low to High with special proteins and energy. |
| How materials move in and out of cells | Through passive transport, Uses no energy--down concentration gradient diffusion Simple Diffusion, Osmosis and facilitated diffusion |
| Different types of membrane transport and how each work | Simple Diffusion is small uncharged molecules pass through the lipid. Osmosis is diffusion of water across membrane. Facilitated diffusion is movement through protein Chanel. Active transport -requires energy Primary active transport andsecondary act |
| Difference between facilitated diffusion and diffusion | diffusion occurs directly through cell membrane for small molecules Facilitated diffusion has the help of proteins to move larger or charged molecules |
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