active transport

• | root hairs

  • takes in minerals & waters
  • has millions of root hairs for a larger surface area to absorb water & mineral ions
  • plants need mineral ions for growth
  • concentration of minerals is higher in root hair than soil around them
• why do plants have loads of root hair cells?

  to have a larger surface area for absorbing water and mineral ions
• | root hairs

  • take in minerals by ACTIVE TRANSPORT
  • allows plants to absorb minerals from DILUTE solutions AGAINST a concentration gradient
  • active transport needs ENERGY from respiration to make it work
• what does active transport need for it to occur?

  energy from respiration
• what's active transport?

  absorbing from a dilute substance against the concentration gradient
• active transport is used in the GUT where there's a lower concentration of nutrients but higher in blood
• | active transport in humans

  • when there's a higher concentration of glucose & amino in gut they diffuse naturally into the blood
  • sometimes there's a lower concentration of nutrients in the gut than there is in blood
  • this means that the concentration gradient is the wrong way
  • active transport allows nutrients to be taken into the blood despite the concentration gradient being the wrong way
  • this means glucose can be taken into the bloodstream when concentration in blood is higher