The primary function of the digestive system, also known as the gastrointestinal (GI) system, is to break down food, prepare it for absorption, and eliminate waste substances. The digestive system consists of a digestive tube called the GI tract or alimentary canal, which includes the esophagus, stomach, and intestines and several accessory organs, including the liver, gallbladder, and pancreas.
The GI tract, extending from the oral cavity (mouth) to the anus, varies in size and structure in several distinct regions. It terminates at the anus, where solid wastes are eliminated from the body by means of defecation. (See Figure Organs of the digestive system (anterior view). )
Organs of the digestive system (anterior view).
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