In tanks using a flapper-flush valve, the outlet at the bottom of the tank is covered by a buoyant (plastic or rubber) cover, or flapper, which is held in place against a fitting (the flush valve seat) by water pressure. To flush the toilet, the user pushes a lever, which lifts the flush valve from the valve seat.
Intestines make up the digestive tract. Photo Credit Denis Raev/iStock/Getty Images. Your intestines make up most of your digestive tract. Much of your digestion takes place in your small intestine, while your large intestine absorbs water and excretes waste. Inflammation of the intestines is the primary characteristic of inflammatory bowel diseases, or IBDs, which include Crohn's disease and colitis. Though dietary measures cannot cure IBDs, according to the Crohn's and Colitis Foundation of America, certain foods may support intestinal healing and help alleviate symptoms.
Most digestion occurs in the upper portion of the small intestine, called the duodenum. Below the duodenum is the jejunum, and then there is the last segment, called the ileum. About 5 percent of undigested food products are broken down in the ileum.This is why some people can have a small part of their intestine removed and still seem to digest most foods with little problem. Digestion of food that enters the small intestine is usually complete after three to ten hours.bout 5 percent of undigested food products are broken down in the ileum. This is why some people can have a small part of their intestine removed and still seem to digest most foods with little problem. Digestion of food that enters the small intestine is usually complete after three to ten hours.