It is also taken for ulcers in the mouth, throat, intestines and stomach. Other species can respire through their skin, intestines, and/or stomach. Unfractionated heparin is usually derived from pig intestines and bovine lungs. Destruction occurs in the esophagus, intestines, and ureters. Flatus is brought to the rectum and pressurized by muscles in the intestines. It works by increasing the amount of calcium absorbed by the intestines and kidneys. This includes vitamin D deficiency due to poor absorption by the intestines or liver disease. Chicken dishes include feet, liver, intestines, and gizzards. They eat their own faeces to acquire nutrients produced by bacteria in their intestines. Chemotherapy often causes mucositis, severe inflammation of primarily the small intestines. There is also fecal matter in the intestines. GZA is hydrolyzed to glycyrrhetic acid in the intestines by bacteria. It plays an important role in lipid transposition in small intestines and calcification of bones. Ileus is a cause of colic in horses due to functional obstruction of the intestines. This shows that glycyrrhetic acid is absorbed and metabolized in the intestines in humans.