The nutrients that the body needs to come from the diet. Enzymes of tractointestinal degrade the diet through the mouth into its various components. The products of digestion are absorbed by the blood through the gut wall and reach the liver through the portal vein. Thanks to the liver tissue can absorb nutrients and use them for their growth and repair, as well as for energy production. In the case of the digestive system, the key questions are: How are ingested food, how are hidrolizan and digested food? How individual nutrients are absorbed, how mobilized the food through the gastrointestinal tract?, And how are eliminated from the body wastes that are not digested?
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