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  • Created by: Rachel
  • Created on: 02-04-13 18:57
  • Large insoluble food molecules are broken down into small soluble molecules by digestive enzymes
  • These products of digestion must be absorbed from the small intestine into the blood, to be delivered to the cells where they are needed

Absorbing food in the small intestine

  • Digested food passes into the blood by diffuson through the intestine and capillary walls
  • The bigger the surface areaa available, the most diffusion can take place
  • The small intestine is a tube about 5m long and 2.5cm in diameter
  • If the inside surface was smooth the surface area would only be about 0.5m squared and every little absorption would take place
  • However, the lining of the small intestine has millions of finger-like folds called villi that make the surface much bigger 
  • If it opened out, the


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