Digestive System | Cleveland Clinic

 

digestive system article

Dig That Digestive System. You can help your digestive system by drinking water and eating a healthy diet that includes foods rich in fiber. High-fiber foods, like fruits, vegetables, and whole grains, make it easier for poop to pass through your system. The digestive system is a . The digestive system is the series of tubelike organs that convert our meals into body fuel. Jan 11,  · The digestive system involves "hollow" organs and "solid" organs. Food travels through the hollow organs — mouth, esophagus, stomach, small intestine, large intestine, and anus. The solid organs — pancreas, liver, and gallbladder — add various Author: Tim Newman.


Digestive System Information and Facts | National Geographic


Human digestive systemthe system used in the human body for the process of digestion, digestive system article. The human digestive system consists primarily of the digestive tractor the series of structures digestive system article organs through which food and liquids pass during their processing into forms absorbable into the bloodstream. The system also consists of the structures through which wastes pass in the process of elimination and other organs that digestive system article juices necessary for the digestive process, digestive system article.

The digestive tract begins at the lips and ends at the anus. It consists of the mouthor oral cavity, with its teethfor grinding the food, and its tonguewhich serves to knead food and mix it with saliva ; the throat, or pharynx ; the esophagus ; the stomach ; the small intestineconsisting of the duodenumthe jejunum, and the ileum ; and the large intestineconsisting of the cecuma closed-end sac digestive system article with the ileum, the ascending colon, the transverse colon, the descending colon, and the sigmoid colonwhich terminates in the rectum.

Glands contributing digestive juices include the salivary glandsthe gastric glands in the stomach lining, the pancreasand the liver and its adjuncts—the gallbladder and bile ducts. All of these organs and glands contribute to the physical and chemical breaking down of ingested food and to the eventual elimination of nondigestible wastes.

Their structures and functions are described step by step in this section. Little digestion of food actually takes place in the mouth. However, through the process of masticationor chewing, food is prepared in the mouth for transport through the upper digestive tract into the stomach and small intestine, where the principal digestive processes take place. Chewing is the first mechanical process to which food is subjected.

Movements of the lower jaw in chewing are brought about by the muscles of mastication the masseter, the temporal, the medial and lateral pterygoids, and the buccinator. The sensitivity of the periodontal membrane that surrounds and supports the teeth, rather than the power of the muscles of mastication, determines the force of the bite.

Mastication is not essential for adequate digestion. Chewing does aid digestion, however, by reducing food to small particles and mixing it digestive system article the saliva secreted by the salivary glands. The saliva lubricates and moistens dry food, while chewing distributes the saliva throughout the food mass.

The movement of the tongue against the hard palate and the cheeks helps to form a rounded mass, or bolusof food.

The lips, digestive system article, two fleshy folds that surround the mouth, digestive system article, are composed externally of skin and internally of mucous membraneor mucosa.

The mucosa is rich in mucus-secreting glands, which together with saliva ensure adequate lubrication for the purposes of speech and mastication, digestive system article. The cheeks, the sides of the mouth, are continuous with the lips and have a similar structure. A distinct fat pad is found in the subcutaneous tissue the tissue beneath the skin digestive system article the cheek; this pad is especially large in infants and is known as the sucking pad.

On the inner surface of each cheek, opposite the second upper molar tooth, is a slight elevation that marks the opening of the parotid duct, leading from the parotid salivary glandwhich is located in front of the ear. Just behind this gland are four to five mucus-secreting glands, the ducts of which open opposite the last molar tooth.

The roof of the mouth is concave and is formed by the hard and soft palate. The hard palate is formed by the horizontal portions of the two palatine bones and the palatine portions of the maxillae, or upper jaws. The hard palate is covered by a thick, somewhat pale mucous membrane that is continuous with that of the gums and is bound to the upper jaw and palate bones by firm fibrous tissue. The soft palate is continuous with the hard palate digestive system article front.

Posteriorly it is continuous with the mucous membrane covering the floor of the nasal cavity. The soft palate is composed of a strong, thin, fibrous sheet, the palatine aponeurosis, and the glossopalatine and pharyngopalatine muscles. A small projection called the uvula hangs free from the posterior of the soft palate. The floor of the mouth can be seen only when the tongue is raised. In the midline is a prominent, elevated fold of mucous membrane frenulum linguae that binds each lip to the gums, and on each side of this is a slight fold called a sublingual digestive system articlefrom which the ducts of the submandibular salivary glands open.

Running outward and backward from each sublingual papilla is a ridge the plica sublingualis that marks the upper edge of the sublingual under the tongue salivary gland and onto which most of the ducts of that gland open. The gums consist of digestive system article membranes connected by thick fibrous tissue to the membrane surrounding the bones of the jaw.

The gum membrane rises to form a collar around the base of the crown exposed portion of each tooth, digestive system article.

Rich in blood vessels, the gum tissues receive branches from the alveolar arteries; these vessels, called alveolar because of their relationship to the alveoli dentales, or tooth sockets, also supply the teeth and the spongy bone of the upper and lower jaws, in which the teeth are lodged.

Human digestive system. Article Digestive system article. Info Print Print. Table Of Contents. Submit Feedback, digestive system article. Thank you for your feedback. Written By: William T. Dworken William Sircus. See Article History. Structures and functions of the human digestive system The digestive tract begins digestive system article the lips and ends at the anus. Start Your Free Trial Today. Load Next Page. More About. Articles from Britannica Encyclopedias for elementary and high school students.

 

Digestive System: MedlinePlus

 

digestive system article

 

Jan 11,  · The digestive system involves "hollow" organs and "solid" organs. Food travels through the hollow organs — mouth, esophagus, stomach, small intestine, large intestine, and anus. The solid organs — pancreas, liver, and gallbladder — add various Author: Tim Newman. Digestive System Articles. The pancreas is a gland in the abdomen that makes insulin, other hormones, and pancreatic juices. This eMedTV Web page describes the location and purpose of this part of the body, including its role in helping the body use and store energy. The entire system is extremely sensitive to our moods. In fact, experts now see stress as a major player in a wide range of digestive problems, including irritable bowel syndrome, indigestion, and heartburn. People with digestive problems often scoff at the idea that stress could be at the root of their w-cohjbook.ga: Chris Woolston, M.S.