Active Transport
- Created by: Jasmin
- Created on: 22-04-13 18:19
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- Active Transport
- Allows cells to move substances from an area of low concentration to an area of high concentration
- Movement is against concentration gradient
- Takes energy for AT system to carry molecule across the membrance and then return to its original position
- Energy for active transport comes from cellular respiration
- Plants use energy from respiration to move mineral ions from soil to roots against CG
- Cells involved have a lot of mitrochondria
- Cells can absorb ions from very dilute solutions and actively absorb substances e.g, sugar and salt against CG using AT
- Root hair cells
- Specialised for absorbing water and minerals
- Tiny projections from cells which push out between the soil particles
- Short pathways needed for movement of water
- Concentration higher in root hair cell than in soil
- Gut/small intestine
- Low concentration of nutrients in gut, high concentration of nutrients in blood
- Glucose and other food molecules then moved from small intestine into blood by AT
- Difference between diffusion and osmosis
- AT against concentration gradient
- AT needs energy
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