digestive tract


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tract

 [trakt]
a longitudinal assemblage of tissues or organs, especially a number of anatomic structures arranged in series and serving a common function, such as the gastrointestinal or urinary tract; also used in reference to a bundle (or fasciculus) of nerve fibers having a common origin, function, and termination within the central nervous system.
alimentary tract alimentary canal.
biliary tract the organs, ducts, and other structures that participate in secretion (the liver), storage (the gallbladder), and delivery (hepatic and bile ducts) of bile into the duodenum. See illustration.
Anatomy of the gallbladder and biliary tract. From Aspinall and Taylor-Robinson, 2002.
corticospinal t's two groups of nerve fibers (the anterior and lateral corticospinal tracts) that originate in the cerebral cortex and run through the spinal cord.
digestive tract alimentary canal.
dorsolateral tract a group of nerve fibers in the lateral funiculus of the spinal cord dorsal to the posterior column.
extrapyramidal tract extrapyramidal system.
gastrointestinal tract the stomach and intestine in continuity; see also digestive system.
iliotibial tract a thickened longitudinal band of fascia lata extending from the tensor muscle downward to the lateral condyle of the tibia.
intestinal tract see intestinal tract.
optic tract the nerve tract proceeding backward from the optic chiasm, around the cerebral peduncle, and dividing into a lateral and medial root, which end in the superior colliculus and lateral geniculate body, respectively.
pyramidal t's collections of motor nerve fibers arising in the brain and passing down through the spinal cord to motor cells in the anterior horns.
respiratory tract respiratory system.
urinary tract the organs and passageways concerned in the production and excretion of urine from the kidneys to the urinary meatus; see also urinary system.
uveal tract the vascular tunic of the eye, comprising the choroid, ciliary body, and iris.

di·ges·tive tract

the passage leading from the mouth to the anus through the pharynx, esophagus, stomach, and intestine.

digestive tract

n.
The mucous membrane-lined tube of the digestive system through which food passes, in which digestion takes place, and from which wastes are eliminated. It extends from the mouth to the anus and includes the pharynx, esophagus, stomach, and intestines.

digestive tract

a musculomembranous tube, about 9 m long, extending from the mouth to the anus and lined with mucous membrane. Its various portions are the mouth, pharynx, esophagus, stomach, small intestine, and large intestine. The tube, which is part of the digestive system, includes numerous accessory organs. Also called alimentary canal, alimentary tract, digestive tube, gastrointestinal tract, intestinal tract, intestinal tubes. See also digestive system.

di·ges·tive tract

(di-jes'tiv trakt)
The passage leading from the mouth to the anus through the pharynx, esophagus, stomach, and intestine.
Synonym(s): alimentary canal, alimentary tract.

Digestive tract

The organs that perform digestion, or changing of food into a form that can be absorbed by the body. They are the esophagus, stomach, small intestine, and large instestine.

di·ges·tive tract

(di-jes'tiv trakt)
Passage from mouth to anus through pharynx, esophagus, stomach, and intestine.
Synonym(s): alimentary tract.

digestive

pertaining to digestion.

digestive enzymes
include salivary (amylase), gastric (pepsin), pancreatic (trypsin, chymotrypsin, amylase, lipase), small intestinal mucosa (carbohydrases including isomaltase, lactase, maltase, sucrase, trehalase).
digestive inoculant
administered mostly to neonates primarily to provide an inoculum of beneficial bacteria and protozoa essential to proper digestion and usually picked up from the environment. In many commercial products the irresistible temptation to include other materials, including dietary essential vitamins and minerals, clouds the effect of the inoculant, and may, as in iron poisoning in foals, cause disaster.
digestive system
the organs that have as their particular function the ingestion, digestion and absorption of food or nutritive elements. They include the mouth, teeth, tongue, pharynx, esophagus, stomach and intestines. The accessory organs of digestion, which contribute secretions important to digestion, include the salivary glands, pancreas, liver and gallbladder. Birds have an unusual system in that there are no teeth and no soft palate in most. There is a pregastric buffer, the crop; the stomach is separated into two organs, one secretory and one muscular, and the large intestine is replaced by a dual cecum. The rectum empties into a cloaca which is shared with the urogenital tract. The ruminant system is complicated by the presence of the forestomachs, the reticulum, rumen and omasum, and there are no upper incisor teeth. The peculiarities of horses are the greatly distended large intestine and the absence of a gallbladder.
digestive tract
the digestive system less the ancillary organs of salivary glands, liver and pancreas; the luminal organs through which food passes. See also alimentary canal.
References in periodicals archive ?
The mean concentration of N in the individual compartments of the digestive tract was somewhat stable at ~4 mg/g in the summer group and ~2 mg/g in the winter group, with the exception of the highest levels at ~9 mg/g in the duodenum in both seasons (Fig.
The intestinal area quotient, vilosity height and the relationships between digestive tract length and fish weight or digestive tract weight can provide important additional information to analyze the feeding habit, but as only data from a few species are available, additional studies must be performed to state if these parameters show a relationship with the feeding habit.
A scan early yesterday revealed problems with the blood flow to his intestines which had caused severe damage to his digestive tract.
KEY WORDS: Haliotis asinina, abalone, digestive tract, aminopeptidase
In the laboratory, the contents of each digestive tract were dried at 38[degrees]C for 48 hours, then weighed to the nearest 0.
Alarming new research reveals that only 2pc of the population are most anxious about developing diseases and conditions of the digestive tract.
The findings suggest that patients with reflux laryngitis lack a certain amount of protective effect that saliva normally provides to the digestive tract via elements like EGF and bicarbonate.
Problems may also occur in every organ system, including the digestive tract, heart, and sex organs.
Scientists discovered that high doses of folic acid found in abundant doses in green leafy vegetables can postpone cancers of the digestive tract.
For a 1999 piece, Building 4 (soap factory), Kennedy used a tiny video camera, designed to enable examination of the digestive tract, to explore the cracks, crevices, and dusty corners of an aging building.
Harvestmen, leafhoppers (Homoptera: Cicadellidae), crickets (Orthoptera: Gryllidae), and spores of the fungus Endogone were each present in the digestive tract of one individual.