The colon is divided into the colon and rectum, and the main physiological function of the colon is to absorb water, glucose and inorganic salts and to store feces. The colon is divided into ascending colon, transverse colon, descending colon and sigmoid colon, where the ascending colon and part of the transverse colon can absorb glucose and amino acids, while the descending colon and sigmoid colon have the main function of storing feces. The colon can also push feces to the distal end by regular contraction and peristalsis. The colon also contains a large number of bacteria, which can inhibit certain pathogenic bacteria, and can also use substances in the intestine to synthesize vitamin K, vitamin B, etc. The main physiological function of the rectum is to be stimulated by feces to produce bowel movements and to assist in defecation.