The upper opening of the large intestine connects to the small intestine and its lower end connects to the anus. The head of the large intestine is what is usually called the anus. They are two different organs in the human body. Colon is divided into colon, rectum and anal canal, the main physiological function of the colon is to absorb water, so that food residues form feces, colon mucosal glands can secrete slightly alkaline mucus, play a role in protecting the intestinal mucosa and lubrication of the feces, it can also secrete potassium, about with the fecal discharge of 4 to 9 ml of potassium, the large intestine can also absorb part of the bile acid, about 5% of the total bile salt library to 10%. The head of the large intestine is usually said to be the anus its role is to be used to discharge the body’s waste organs. The anus needs to be cleaned more often to avoid infection, and it is recommended to eat a light diet to avoid constipation.