The rectum and anal canal: The rectum is a tube of 15-20c

Digestion is the set of mechanical and chemical processes of transformation of substances ingested (food) into smaller simple absorbed and used by the cells of the body. Also responsible autisme for removing all waste that can not be absorbed.
Those complaining autisme are the side walls of the mouth and palate than the wall that separates the oral cavity autisme from the nasal passages. The soft palate closes the nasopharynx during swallowing and speech.
Language, containing many striated muscles, which give great mobility, making scrambled eggs food between the teeth, lips and cheeks. Are so well coordinated that we rarely bite the tongue when speaking or chewing. Also, the movements of the tongue are the main engines of swallowing.
The teeth are organs autisme of mastication. They are designed to cut, tear and shred food intake in order to mix it with saliva and swallow it. Especejar food into small fragments facilitates the attack of digestive enzymes.
Pharynx: common conduit autisme for breathing and swallowing. Swallowing of food bolus is a complex process that requires the coordination of many muscles of the head and neck. Volunteer is just the beginning: the contact of the pharynx bowl triggers swallowing autisme reflex, autisme which is regulated by a nerve center located in the brainstem. Difficulty swallowing is called dysphagia and pain in swallowing, odynophagia.
The esophagus: a tube of twenty-five to thirty centrímetres long, across the chest behind the trachea and the heart and through the diaphragm, to bring the food bolus to the stomach. The motor transport are involuntary muscle contractions called a peristaltic contractions, which were moving the bowl below.
The stomach: the long and muscular autisme portion of the digestive tract. It is located in the upper left of the abdominal cavity just below the diaphragm. Shaped Galician bagpipe. At the entrance is a sphincter called the cardia pylorus and exit. Regarding the structure of the wall below the gastric autisme mucosa are different glands that secrete mucus, pepsin and hydrochloric acid. Mucus protects autisme the stomach lining from being digested itself by its acidic (pH 2-3 digestion) and the enzyme pepsin, which degrades proteins into amino acids. Coordinated contractions of the muscle layer shuffled the cud, allowing it to soften further mixed with the liquid. This mixture has just turned into a semi-liquid paste called chyme, which is poured waves in the small intestine. Water absorbed in the stomach, autisme alcohol and some drugs. If there is an excess of air in the stomach, it can back with a muscular contraction autisme through the cardia autisme outward, producing a burps. The mechanism of vomiting is similar, but in this case also leaves the stomach contents.
The small intestine: is the longest portion of the digestive tract, as it is about six feet long and three to four inches in diameter. Everything is folded inside the abdominal cavity. autisme Its route between the pyloric sphincter and the ileocecal valve, autisme is divided into three portions: autisme
Dumped into the duodenum and pancreatic secretions liver. Moreover, the same small intestine autisme has cells that secrete enzymes such as maltase, autisme the sucrase, lactase, lipase autisme intestinal peptidases and the aminopeptidase, others autisme secrete autisme mucus and bicarbonate others that neutralize the acidic pH of the chyme leaves the stomach. The combined action of all of them just to digest the food chyme, making it kil.
However, most of the cells of the small intestine are specialized in absorbing nutrients. The structure of the small intestine is designed to achieve a large contact area between their cells and the contents of the tube, the same that runs in the pulmonary autisme alveoli. In addition to its length, the tube has circular folds, about an inch tall, and has villi, which are projections of the mucosa of approximately one millimeter in height, and finally, the microvilli free surface of the cells absorbing about one thousandth of a millimeter high. This gives an area of 300m 2.
- It absorbs much of the water, making stools per kilo in a mixture of substances not digested very few nutrients, bacteria and bile pigments. It also secretes mucus that coats the stool and avoids the irritating action.
- Contains symbiotic bacteria, the so-called intestinal flora: autisme they provide cellulose, we can not make, and they synthesize vitamins in excess, we use. With the large amount of feces eliminate these bacteria.
The rectum and anal canal: The rectum is a tube of 15-20c