in living beings as the digestive system may vary but always to the above vertebrate anteriormente.Los have a developed digestive system, consists of the following organs: 
Inside are teeth whose function is to cut and grind food (mechanical digestion) 
found in the mouth the tongue (which has a large number of taste buds) whose function is to mix food and facilitate their passage into the esophagus. 
flow in the oral cavity salivary glands. 
secrete saliva, whose functions are to serve as lubricantedestruir the bacteria ingested with alimentoscomenzar chemical digestion by enzymes.
Once the processes taking place in the oral cavity, there is the swallowing of food eaten.
Pharynx 
The pharynx is a muscular tube that connects the device to the respiratory tract.
To remain closed airway during swallowing in the pharynx forms a fold, called epiglottis obstructing the glottis. 
This will prevent food from entering the respiratory system.
Esophagus 
The bolus is released from the tongue to the edge of the gorge and then through the pharyngeal muscles, the esophagus, through which, through a series of peristaltic movements, results in the stomach.
Stomach
It is an expansion of the digestive tract, where food is stored for a time to pass into the intestine in an advanced state of digestion.
Consisting of a cardiac region, which borders the esophagus through a so-called cardiac sphincter, a middle region, called the body and pyloric region that communicates with the intestine through the pyloric sphincter.
The stomach is muscular, so thanks to her contractions, the mechanical action is completed. In addition it is made of chemical digestion, by the action of gastric juice secreted by glands in the walls. In general, after remaining in the stomach long enough, food form a slurry called chyme, which gradually pass into the intestine
Small intestine: Consisting of three parts: duodenum, jejunum, ileum
two distinct functions are performed: the chemical digestion of food andthe total absorption of these
Duodenum.
flow in this stretch: the liver, which secretes 
the bilisel pancreas secretes pancreatic juice. Also on the walls of the intestinal mucosa as lasGlándulas there are other glands that secrete mucus of Brunner's glands and Lieberkühn, intestinal.El juice secreted by the action of these juices is to ensure that: carbohydrates are processed of monosaccharides, fats are broken into fatty acids and glycerin, and that the proteins are broken down into amino acids.
After the digestion, chyme has turned into a milky liquid called chyle formed by water, monosaccharides, amino acids, glycerol, nitrogen bases and undigested products.
digestion has been completed and their products must cross the intestinal wall (absorption) to enter the bloodstream and be transported to all body cells. The absorption takes place molecule by molecule through the intestinal wall.
intestine
is separated from the small intestine by the ileocecal valve. Its mucosa presents a transverse folds, which give a characteristic appearance. The glands secrete mucus lining the mucosa.
Along the intestine absorbs a large amount of water, so that as they approach the final leg carried by peristalsis, are thickened. These products are expelled outside the defecación.Entre process called egestion or waste products are the plant cell walls, at whose expense they live a number of saprophytic bacteria symbionts (intestinal flora), which produce fermentation with evolution gas. They also produce some useful substances to the body, such as vitamin K.
In the large intestine also develops the absorption of water in the liquid material into a mass more consistent, and mucous glands secrete mucus that lubricates the fecal mass that must pass from the intestine to recto.La progression of this dough is made by peristalsis spaced at long intervals.
Defecation is a reflex, but you can control (somewhat) by the will. Faeces at the time of his removal, are formed in 65% water and other bacteria in large numbers (Mostly dead before disposal), and derivatives division, fermentation and putrefaction, products of intestinal secretion, bile pigments and minerals.
glands
addition to the salivary glands, there are two glands that contribute to digestion:
The pancreas and liver
The pancreas is a gland mixed, because it secretes hormones (endocrine component), and pancreatic juice (exocrine component).
pancreatic juice reaches the intestine through the conduit of Wirsung, which flows along the common bile duct in the ampulla of Vater.
's mission is fundamentally liver metabolism, but helps digestion by bile. It is stored in the gallbladder. Plays an important role in digestion of fats, as it helps to divide the fatty substances in smaller particles, thereby facilitating attack lipase enzymes to increase the area of \u200b\u200bfat droplets
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