Endocrine glands - gastro-intestinal mucosa, Biology

GASTRO-INTESTINAL MUCOSA -

It develops from the endoderm of the embryo.

Inner most layer of the wall of the alimentary canal is called mucosa. Certain cells of the mucosa of the stomach and intestine secrete important hormones.

(a) STOMACH. The mucosa of the pyloric region of the stomach synthesizes, stores and secretes the hormone gastrin. This hormone stimulates the secretion of gastric juice and movements of the stomach.

(b) INTESTINE. It secretes the following hormones.

(i) Secretin. It is secreted by the intestinal mucosa of duodenum and jejunum. It causes the release of water and sodium bicarbonate from the pancreas in the pancreatic juice and from the liver in the bile. Secretin also inhibits the secretion and movements of the stomach. Secretin was the first hormone discovered by Bayliss & Sturling.

(ii) Cholecystokinin-pancreozymin (CCK-PZ). This hormone is secreted by the mucosa of entire small intestine. The actions of cholecystokinin and pancreozymin were discovered independently.

This hormone stimulates the gall bladder to release the bile and also stimulates the pancreas to release its enzymes.

(iii) Enterogastrine (= Gastric Inhibitory Peptide-GIP). It is secreted by duodenal mucosa that inhibits gastric secretion and contractions.

(iv) Duocrinin. This hormone is also secreted by duodenal mucosa. It stimulates the Brunner's glands to release mucus and a few enzymes into the intestinal juice.

(v) Enterocrinin. It is also secreted by duodenal mucosa. It stimulates the crypts of Lieberkuhn to secrete the enzymes in the intestinal juice.

(vi) Vasoactive Intestinal Peptide (VIP). It is secreted by the small intestine. It dilates peripheral blood vessels of the small intestine and inhibits gastric acid secretion.

(vii) Villicrinin. It is secreted by the mucosa of entire small instestine. It accelerates the movement of intestinal villi to facilitate the absorption of food in the small intestine.

Posted Date: 10/2/2012 7:21:44 AM | Location : United States







Related Discussions:- Endocrine glands - gastro-intestinal mucosa, Assignment Help, Ask Question on Endocrine glands - gastro-intestinal mucosa, Get Answer, Expert's Help, Endocrine glands - gastro-intestinal mucosa Discussions

Write discussion on Endocrine glands - gastro-intestinal mucosa
Your posts are moderated
Related Questions
CHITIN It is polymer of N-acetyl-D-glucosamine. It is a structural homopolysaccharide found in the fungal walls as fungus cellulose and as chitin in the exoskeleton of

What are the synthetic auxins and what are their uses? The Synthetic auxins like naphthalenic acid (NAA) and indolebutyric acid (IBA) are substances similar to IAA (a natural a

What are the functions of biotin and pantothenic acid for the body? How are these vitamins obtained? Biotin (also called as vitamin B8) is a vitamin that acts in the metabolism

Transcription   continues   until a termination   series   is reached.   The most common termination signal is a GC-rich region which is a palindrome, followed by an AT-rich sequen

What is demography? The scientific study of human population is termed as 'Demography'. It focuses attention on three readily observable human phenomena: a) Changes in popul

Q. Explain about Oral Glucose Tolerance Test? This is most commonly used diagnostic test particularly for identifying new and ‘at risk' individua1s.Thi.s test is carried out af

Q. What is biological control? The Biological control is a natural method to control the size of microorganism, animal or plant populations. The Biological control is based on

Q. What is the function of vitamin E? In which foods can it be found? Vitamin E is also known as tocopherol is a fat-soluble vitamin that participates as coenzyme in the respir

prove oxygen is produced during photosynthesis in the presence of light

Explain Protoderm in primary growth in shoot? The protoderm is one of the so-called "primary tissues" because it is formed first during germination and subsequent bud growth an