active transport

• Active transport


  The movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy from cellular respiration
• Active transport


  • Takes place across a membrane
  • Requires special proteins in the membrane to transfer molecules
• Cellular respiration


  Provides the energy for active transport
• ATP


  Molecules that store the energy from cellular respiration and transport it to different parts of the cell
• Root hair cells


  • Have a large surface area for absorption
  • Have many mitochondria to provide energy for active transport
• Active transport in root hair cells

  1. Absorb water and mineral ions from the soil

  2. Against their concentration gradient

  3. Using energy from cellular respiration
• Root hair cells need to absorb mineral ions like magnesium and nitrates at a higher concentration inside the cell than outside in the soil
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