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Digestion. Sucrose digestion does not begin until the sugar reaches the small intestine. Your body cannot absorb polysaccharides as is, so it must first break sucrose down into its component parts.ucrose, commonly known as table sugar, consists of one molecule of glucose and one molecule of fructose.
Absorption and egestion. These are the processes that happen in the digestive system: ingestion (eating) â digestion (breaking down) â absorption â egestion. We've already looked at how foods are broken down by enzymes in digestion. Now we will look at how the products of digestion are absorbed into the body. Absorption. Digested food molecules are absorbed in the small intestine. This means that they pass through the wall of the small intestine and into our bloodstream. Once in the bloodstream, the digested food molecules are carried around the body to where they are needed. Only small, soluble substances can pass across the wall of the small intestine. Large insoluble substances cannot pass through.