What happens in to the small intestine?

Answer 1

In the small intestine, the food is digested for the last time in the digestive system. Bile, pancreatic juice and intestinal juice are let into the small intestine when the food enters the small intestine. The bile acid is the greenish liquid that that breaks down the large fat molecule into small fat molecule. The intestinal and pancreatic juice contain protease, carbohydrase and lipase. The pancreatic juice is made in the pancreas and it flows into the small intestine while the intestinal juice is made in the small intestine itself. The protease break down the polypeptide into amino acids, carbohydrase break down maltose into glucose and the lipase will break down the small fat molecule into glycerol and fatty acid. the walls of the small intestine have many blood vessels. Only the simple molecules such as amino acids, glucose, glycerol and fatty acids can be absorbed into the blood vessels. The large molecules such as proteins, polypeptide, carbohydrate, maltose and fats cannot enter the bloodstream as they are too big to be absorbed and so all this big nutrient molecules will be passed on to the large intestine to be disposed off through the anus in the form of faeces. The walls of the small intestine are filled villi which provide a large surface area for the absorption of nutrients to be faster.