intestinal juice
Noun | 1. | intestinal juice - secretions by glands lining the walls of the intestines |
单词 | intestinal juice | |||
释义 | intestinal juice
Intestinal Juiceintestinal juice[in′tes·tən·əl ¦jüs]Intestinal Juicethe secreta of glands of the small and large intestines; a colorless or yellowish fluid with an alkaline reaction and containing clumps of mucous and cast-off epithelial cells. Man secretes 1–3 liters of intestinal juice a day, depending on the type of food eaten and the individual’s physical condition. Intestinal juice is secreted continuously, in response to mechanical stimulation of the mucous membrane by the intestinal content, or chyme. The density of the juice in man and animals varies from 1.007 to 1.009. Intestinal juice is composed of water and organic and inorganic substances; the solid residue (1.2–1.5 percent) is similar in composition to the cells of the cast-off epithelium. Small amounts of enzymes are found in intestinal juice: amylase, saccharase, maltase, amino peptidases, enterokinase, monoglyceride lipase, phosphatase, and nucleotidase. These enzymes are absent only in the distal portions of the large intestine. Intestinal secretion is regulated by nervous and humoral mechanisms. The parasympathetic (cholinergic) division of the autonomic system stimulates intestinal secretion; the sympathetic (adrenergic) division inhibits it. N. M. TIMOFEEVA intestinal juicejuice[jo̳s]in·tes·ti·nal juiceintestinal juiceA nonspecific, generic term for the sum total of intestinal secretions after the stomach, which consists of secretions from the exocrine pancreas via the ampulla of Vater. The key digestive enzyme, trypsin, is secreted in the inactive form as trypsinogen and activated by enterokinase in the intestine; trypsin in turn activates other proteases—e.g., pro-colipase, which is converted to colipase. Intestinal juice contains bile salts, digestive enzymes, mucus, hormones and high-pH secretions, which neutralise hydrochloric acid of gastric origin.in·tes·ti·nal juice(in-testi-năl jūs)intestinal juice
Words related to intestinal juice
|
|||
随便看 |
|
英语词典包含2567994条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。