Active Transport
- Created by: eleanorcooperxo
- Created on: 12-02-17 12:17
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- Active Transport
- Definition
- the movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes, requiring energy.
- substances are absorbed against a concentration gradient from a lower to high concentration
- Root Hair Cells
- specialised for absorbing minerals and water
- roots grow into long "hairs", giving them a larger surface area for absorbing water and minerals
- the concentration of minerals is usually higher than in the root hair cell than in the soil around it
- active transport allows the plant to absorb minerals from a dilute solution
- active transport NEEDS ENERGY from respiration for it to work
- Active Transport In Humans
- active transport is used in the gut when there is a low concentration of nutrients in the gut, bt a higher concentration of nutrients in the blood
- when there is a high concentration of glucose and amino acids in the gut they diffuse naturally into the blood
- sometimes there is a low concentration of nuutrients in the gut than there is in the blood, meaning the concentration gradient is the wrong way
- active transport allows nutrients to be taken into the blood, even when the concentration gradient is the wrong way
- Definition
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