The anus is the opening at the end of the digestive tract where waste leaves the body. It is surrounded by muscles that help control the release of stool. The anus plays a crucial role in the excretory system, which is responsible for eliminating waste materials from the body. In humans, the anus is located at the lower end of the rectum, which stores feces before they are expelled. Proper functioning of the anus is important for maintaining overall health, as it helps prevent issues such as constipation and incontinence. Regular bowel movements are essential for a healthy digestive system.