The urinary tract or the intestines may be infected. The stomach is a major organ of the gastrointestinal tract and digestive system. The rectum is a part of the lower gastrointestinal tract. Lactose intolerance does not cause damage to the gastrointestinal tract. Birds have a cloaca into which the urinary, reproductive tract (vagina) and gastrointestinal tract empty. It could be caused by a low-grade urinary tract or yeast infection. Most infections with adenovirus result in infections of the upper respiratory tract. Methyldopa exhibits variable absorption from the gastrointestinal tract. Gut organoids refer to organoids that recapitulate structures of the gastrointestinal tract. It is the primary facultative anaerobe of the human gastrointestinal tract. This motility problem results from atrophy of the gastrointestinal tract wall smooth muscle. There are a number of non-infectious causes of inflammation of the gastrointestinal tract. This motion is apparent of the gastrointestinal tract. The common cold is a viral infection of the upper respiratory tract. The enveloped portions form the basis for the adult gastrointestinal tract.