Exchange of materials- OSMOSIS
- Created by: georgia lines
- Created on: 04-02-13 16:16
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- Osmosis
- Osmosis
- Partially permeable cell membranes let water move across them
- Dilute solution of sugar- high concentration of water, low of sugar
- Concentrated sugar solution- low concentration of water, high of sugar
- Cytoplasm
- Made of chemicals dissolved in water inside partially permeable bag of cell membrane
- Concentrated solution-sugars and salts
- Water moves from high to low concentration of water molecules across membrane
- In animals
- Cell uses up water in chemical reactions-> cytoplasm-> more concentrated
- If solution out of cell is more dilute than in the cell, water will move into cell by osmosis-> cell will swell + burst
- If solution out of the cell is more concentrated than in the cell, water moves out of the cell-> cytoplasm-> too concentrated-> cell shrivels
- In plants
- Water moves into plant cells-> vacuole swells + presses cytoplasm against plant cell walls-> pressure-> cell is hard and rigid
- To keep leaves and stems firm + rigid!!
- Surrounding fluids need to be dilute solution of chemicals (more water) than the cytoplasm of cells
- Water moves into plant cells-> vacuole swells + presses cytoplasm against plant cell walls-> pressure-> cell is hard and rigid
- Osmosis
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