Active Transport

• Active Transport


  Active transport moves substances from a more dilute solution to a more concentrated solution (against the concentration gradient)

  • Active transport does require energy
  • Diffusion does not require energy (passive process)
• Lumen of small intestine

  • Concentration of sugars in the lumen is lower than concentration inside the cell
  • So sugars will be carried in by active transport (not diffusion)
  • Once inside the cell, the sugars can then be transported into the bloodstream and carried around the body
  • Cells have many mitochondria for aerobic respiration to provide the energy for active transport
• Root hair cell

  • Concentration of ions in the soil is lower than the concentration inside the root hair cell
  • So, active transport is used to move the ions into the cell
  • Ions are then transported into the xylem cell and moved to the leaf
  • Cell also has many mitochondria to provide the energy for active transport