Feces, also stool, excreta, or residual waste materials, evacuated from the bowels. Through peristalsis (involuntary intestinal contractions) and digestion, partly digested food begins to assume the aspects of feces when it passes from the small intestine to the large intestine. In a healthy digestive system, feces consist of undigested and indigestible food products such as mucous secretions and cellulose; traces of intestinal juices from the liver, the pancreas, and other digestive glands; undestroyed enzymes; leucocytes; epithelial cells; cellular debris from the intestinal walls; fat globules; nitrogenous protein products; mineral salts; water; and large numbers of bacteria. Probably one-third of the weight of human stool is composed of bacterial debris; an average of 100 billion bacteria are excreted daily by each human being. More than 75 different kinds of bacteria are found in stool. The unpleasant odor of human feces is chiefly due to the presence of the two-ringed organic compound skatole, C9H9N. In monotreme mammals, in birds, reptiles, and fishes, and in many lower animals, urine is mixed with the feces before evacuation.
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This quote was added November 29, 2007.