Digestive...

Gastrointestinal tract
Gastrointestinal tract is a device composed of members within multicellular animals, have this way of food, to digest draw energy and nutrients, and expels the remaining waste. For the main functions of gastrointestinal tract are ingestion, digestion, and absorption, and defecation.

Gastrointestinal tract differs substantially from animal to another. Some animals have the equipment multiple cavities, while equipment and other animals made up of only one cavity. To mention an adult, the longest length of the gastrointestinal tract approximately 6.5 meters (20 feet) and consists of a tract infectious Almaoyen top and bottom. Can be divided into the intestinal tract infectious also foregut, midgut, and hindgut, to show the embryonic origin of each piece of it.

[Edit] the upper gastrointestinal tract
Upper gastrointestinal tract consists of the mouth, pharynx, esophagus, and stomach.

Contains the oral mucosa Alcdeghi, which includes slots salivary glands, tongue, teeth.
Behind the mouth lies the pharynx, which in turn leads to a hollow muscular tube, is the esophagus.
Altmajat occur, which is a muscle contractions to push food along the esophagus, which extends across the chest and pierces the diaphragm to reach the stomach
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