What is the function of digestive organs and digestive process

The digestion of whole human food starts from the mouth. When food enters the mouth, it is first chewed for physical digestion. Salivary amylase in the mouth can initially digest starch into maltose. When food enters the stomach, gastric acid and enzymes in the stomach can further digest food. When it further enters the 12 duodenum and small intestine, pancreatic amylase and bile can digest fat, etc., and the small intestine will absorb most nutrients. The rest of the food residue enters the large intestine. The large intestine further absorbs the remaining nutrients and water, forming stool, and then passes through the sigmoid colon and anus to be discharged from the body.