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Most of the absorption part of the digestive process occurs in the jejunum and the ileum of the small intestine, though alcohol is readily absorbed through the stomach.hemical processes that contribute to digestion also begin in the mouth with action of saliva on food. However, most of the chemical digestive processes occur in the stomach and small intestine-where the partly-digested materials are subjected to gastric juices, pancreatic juice, succus entericus and so on.
In our last issue, we explored the physiology of digestion in the small intestine and started our discussion of nutrient absorption. In this issue, we conclude that discussion. Effectively, this is the heart and soul of our entire series on the digestive tract. Ultimately, everything that happens in the digestive tract is designed to get nutrients into the bloodstream. The final step in the process, absorption, is in many ways the most fascinating part of the discussion. Stomach acid unwinding proteins and pepsin breaking them down -- that's simple stuff.