Pancreas and its structure, Biology

PANCREAS -

It is derived from the endoderm of the embryo.

Structure. The pancreas lies inferior to the stomach in a bend of the duodenum.

  • It is both an exocrine and an endocrine gland i.e. heterocrine gland.
  • A large pancreatic duct runs through the gland, carrying enzymes and other exocrine digestive secretions from the pancreatic acinar cells to the small intestine. The tissue of the pancreas has in addition to the acinar cells, groups of cells called islets of Langerhans, after the name of their discoverer (1869), which produce endocrine secretions.
  • Four kinds of cells have been identified in the islets.

(i) Alpha cells (about 20%) produce glucagon. Alpha cells are also called A-cells. (ii) Beta cells (about 70%) produce insulin. Beta cells are also called B-cells.

(iii) Delta cells or D-cells (about 5%) produce somatostatin (SS). (iv) PP cells or F-cells (5%), produce pancreatic polypeptide (PP).

  • Beta cells are usually found towards the middle of the islet, the alpha cells towards the periphery of the islet and┬áDelta (D) and F-cells are found scattered.

720_pancreas.png

Posted Date: 10/2/2012 7:01:14 AM | Location : United States







Related Discussions:- Pancreas and its structure, Assignment Help, Ask Question on Pancreas and its structure, Get Answer, Expert's Help, Pancreas and its structure Discussions

Write discussion on Pancreas and its structure
Your posts are moderated
Related Questions
Explain Systematic - Modern Trends in Animal Taxonomy Systematic is defined as the study of relationship among organisms which means reconstruction of phylogenies. It is that b

Q. What are age pyramids? Age pyramids are the graphical representations in form of superposed rectangles each representing the number of individuals included in age ranges int

The probability of an individual in a trihybrid F2 generation showing the dominant phenotype for just two traits?


Explain the Fistulative surgery - Endodontic Surgery = (Incision and drainage) 1 Cortical trephination 2 Decompression 3

Q. Can you define termination of the stress Test? Test should be terminated when: 1) PVCS develop in pairs or with increasing frequency or when ventricular tachycardia devel

what are the branches of applied biology?

What is eutrophication" describe its consequences on the life of plants and animals living in such waters. Why is oxygen depletion in a eutrophicated water-body faster at nigh

How does bisulfite sequencing work ?

Q. What is the importance of iron in diet? What is the disease caused by iron deficiency? Iron acts as a constituent of the hemoglobin molecule and of enzymes of the energetic