The main site of absorption is in the small intestine. The stomach and large intestine also have partial absorption functions.
After the human body ingests water and food through the mouth, esophagus, through the cardia into the stomach, after the stomach grinding and stirring to form chowder, and then through the pylorus into the small intestine, which is divided into the duodenum, jejunum and ileum in three parts, after the absorption of the small intestine, the remaining food residue into the large intestine, and ultimately discharged from the body, which, the stomach, the small intestine and the large intestine have the function of absorption.
The small intestine is the most important absorption part of the human body, the movement of the smooth muscle of the small intestine can complete the grinding, mixing, stirring and other mechanical digestion of the surimi, the small intestinal glands secreted by the small intestinal fluid with bile and pancreatic juices in the small intestine to complete the chemical digestion of the surimi, the mucous membrane of the small intestine will be the surimi of the vast majority of nutrients absorbed, and at the same time can also be secreted a variety of digestive tract hormones to help digestion.
The main function of the stomach is to mix and grind to facilitate further digestion and absorption in the small intestine, and only part of the water and alcohol can be absorbed. The main function of the large intestine is to mix the food residues and expel them from the body, during which the large intestine absorbs some water and electrolytes.
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