small intestine

n. The narrow, winding, upper part of the intestine where digestion is completed and nutrients are absorbed by the blood. It extends from the pylorus to the cecum and consists of the duodenum, the jejunum, and the ileum. Also called small bowel.

small intestine

n (Anatomy) the longest part of the alimentary canal, consisting of the duodenum, jejunum, and ileum, in which digestion is completed. Compare large intestine

in•tes•tine

(ɪnˈtɛs tɪn)

n. 1. Usu., intestines. the lower part of the alimentary canal, extending from the pylorus to the anus. 2. Also called small intestine. the narrow, longer part of the intestines, comprising the duodenum, jejunum, and ileum, that serves to digest and absorb nutrients. 3. Also called large intestine. the broad, shorter part of the intestines, comprising the cecum, colon, and rectum, that absorbs water from and eliminates the residues of digestion. adj. 4. internal; domestic; civil: intestine strife. [1525–35; < Latin intestīnum, n. use of neuter of intestīnus internal]

small intestine

The long, narrow, coiled section of the intestine that extends from the stomach to the beginning of the large intestine and in mammals is made up of the duodenum, jejunum, and ileum. Nutrients are absorbed into the bloodstream from the small intestine.

small intestine

Part of the alimentary canal between the stomach and the large intestine. It includes the duodenum, jejunum, and ileum. Most digestion occurs in the small intestine.

Thesaurus

Noun

small intestine - the longest part of the alimentary canal; where digestion is completedarteria ileum, ileal artery, intestinal artery - branch of the superior mesenteric artery that supplies the ileumintestinal artery, jejunal artery - an artery that is a branch of the superior mesenteric artery that supplies the jejunumalimentary canal, alimentary tract, digestive tract, digestive tube, gastrointestinal tract, GI tract - tubular passage of mucous membrane and muscle extending about 8.3 meters from mouth to anus; functions in digestion and eliminationbowel, gut, intestine - the part of the alimentary canal between the stomach and the anusduodenum - the part of the small intestine between the stomach and the jejunumjejunum - the part of the small intestine between the duodenum and the ileumileum - the part of the small intestine between the jejunum and the cecum

Translations

intestin grêleintestino tenueтонкая кишка

small intestine

small intestine:

see intestineintestine,
muscular hoselike portion of the gastrointestinal tract extending from the lower end of the stomach (pylorus) to the anal opening. In humans this fairly narrow (about 1 in./2.
..... Click the link for more information. .

Intestine, Small

the portion of the gut of vertebrate mammals, including man, that is situated between the stomach and the large intestine. The final digestion of food, the absorption of nutrients, and the movement of chyme occur in the small intestine.

In mammals, including man, the small intestine is divided into three sections: the duodenum, the jejunum, and the ileum. The length of the small intestine differs according to the nature of the digestive process: in man it is 6–7 m long, in cattle 27–49 m, in dogs 1.8–4.8 m, in cats 0.8–1.3 m, and in swine 16–21 m. In man the diameter of the small intestine is 48 mm in the initial section and 27 mm at the place where the ileum empties into the large intestine.

The walls of all sections of the small intestine are composed of mucous, submucous, and serous membranes and a muscular coat. Each section varies in the microscopic and submicroscopic characteristics of the intestinal wall, which reflect differences in function. The surface area of the small intestine’s mucous membrane is greatly increased by folds and protuberances: examples are the spiral valve in the mucous membrane of some fishes, and the villi, folds, and crypts in the small intestine of birds, mammals, and man.

Food is digested both in the intestinal cavity itself and by means of membrane-mediated (parietal) digestion. Cavitary digestion is achieved by the flow of pancreatic juice, bile, and intestinal juice into the lumen of the small intestine. During this process, supramolecular aggregates and the large molecules of proteins, carbohydrates, and fats in the food mass are hydrolyzed by the proteolytic, amylolytic, and lipolytic enzymes in the small intestine. The products of intermediate hydrolysis are adsorbed on the surface of the mucous membrane of the small intestine, where the final stages of hydrolysis and transition to absorption take place.

Parietal digestion is achieved by means of enzymes that are structurally bound to the cell membranes of the intestinal epithelium. The digestion and absorption of food in the small intestine are accompanied by contractions of the intestinal walls that mix and stir the chyme and propel it through the intestine.

IA. L. KARAGANOV

small intestine

[′smȯl in′tes·tən] (anatomy) The anterior portion of the intestine in humans and other mammals; it is divided into three parts, the duodenum, the jejunum, and the ileum.

small intestine

the longest part of the alimentary canal, consisting of the duodenum, jejunum, and ileum, in which digestion is completed

small intestine

small intestine

small intestine

in•tes•tine

small intestine

small intestine

small intestine

small intestine:

Intestine, Small

small intestine

small intestine

small intestine

small in·tes·tine

small intestine

small in·tes·tine

small intestine

small intestine

small intestine

Words related to small intestine

noun the longest part of the alimentary canal

Related Words