active transport

• what is active transport

  • active transport is the movement of molecules across a membrane, from a region of lower concentration to a region of higher concentration
  • this requires energy from respiration
• what is meant by 'against the concentration gradient'

  movement from lower concentration to higher concentration
• how do plant root hair cells use active transport

  root hair cells use active transport to absorb mineral ions (such as magnesium and nitrate ions) from the soil
• does active transport require energy 


  yes
• which subcellular structure (organelle) provide the energy required for active transport

  mitochondria provides the energy required for active transport
• glucose is absorbed into the bloodstream from the gut how does active transport and diffusion take part in this

  • at first the glucose is absorbed by diffusion, because there is a higher concentration in the small intestine than in the bloodstream
  • however, once most of the glucose has been absorbed, there will be a higher concentration in the bloodstream and so the remaining glucose will have to be absorbed by active transport