Transport in cells
- Created by: Epic Al
- Created on: 25-06-22 10:30
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- Transport in cells
- Diffusion
- Net movement from high to low concentration
- All particles (solid, liquid, gas)
- Factors
- Difference in concentration
- temperature
- surface area
- Dissolved substances and gases move in and out of cells by diffusion
- Osmosis
- movement of water from low to high concentration
- through a partially permeable membrane
- animal cells can be damaged if the concentration outside the cell changes dramatically
- Osmosis in plants
- Important to maintain Turgor in plant cells
- if the outside solution is hypotonic, water moves in and keeps the cells rigid
- Turgid cell (normal)
- flaccid, water leaving the cell, not as rigid
- plasmolysed, water leaving with no water coming in
- pulling away from the cell membrane
- Active Transport
- dilute -> concentrated (against the concentration gradient)
- requires energy from respiration
- Allows root cells to absorb healthy ions
- Allows sugar molecules can be absorbed from the gut for respiration
- Diffusion
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