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Small intestine

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The small intestine is between the stomach and the large intestine. In humans over 5 years old, a small intestine is about 7.5 meter long. It is where most of the digestion and absorption happens.[1]

The small intestine has three regions – the duodenum, jejunum and ileum.

  • The duodenum receives bile and juice from the pancreas. It is where most digestion takes place. Secretions neutralise the stomach acidity, and enzymes digest the food.
  • The jejenum: the products of digestion (sugars, amino acids, and fatty acids) are absorbed into the bloodstream here.
  • The ileum: absorbs vitamin B12 and bile salts and any products of digestion which were not absorbed by the jejunum.


  1. The main function of the small intestine is the absorption of nutrients and minerals from food. [1]