Active and Co-transport

• Co-transport


  Carrier protein moving 2 molecules at once
• Co-transport example


  Glucose from small intestine to blood via epithelial cells
• Co-transport step 1

  Glucose moves into blood via facilitated diffusion as there’s a high concentration of epithelial cells
• Co-transport step 2


  To achieve a low concentration of Na+ in epithelial cell active transport of 3Na+ out and 2K+ in needs to happen
• Co-transport step 3


  Na+ can facilitate diffuse out of the small intestine bringing glucose with it through the Co-transport carrier protein