Hormones of pancreas, Biology

HORMONES OF PANCREAS AND THEIR ROLE -

(i) Glucagon (Secreted by a-cells)

  • It stimulates the liver to convert stored glycogen into glucose.
  • Glucagon is controlled by feedback in accordance with the level of glucose in the blood. When the blood sugar rises, the secretion of glucagon is suppressed and when it drops, the secretion of glucagon is stimulated.

Target Cells. Glucagon acts on the cells of the liver and adipose tissue.

(ii) Insulin (Secreted by b-cells)

  • It was first prepared / found by Benting and Best.
  • A. F. sanger coined the term insulin & proposed the molecular structure of insulin (cow's insuline)
  • Human insulin was synthesized by "Tsan".
  • Insulin was the first protein that was artificially synthesized in laboratory and is crystallized.
  • One molecule of insulin is made up of 51 amino acids that has 2 chains - (i) a-chain. It is made up of 21 aminoacids.

(ii) b-chain. It is made up of 30 amino acids. Both the branches or chains are bind together with cross bonds of disulphide bonds.

(iii) Somatostatin (SS)

It regulates the secretion of insulin and glucagon.

Target Cells. Both somatostatin and pancreatic polypeptide act on the cells of the pancreas.

(iv) Pancreatic Polypeptide (PP).

It appears that pancreatic polypeptide inhibits the release of digestive' secretion of the pancreas.

Both somatostatin and pancreatic polypeptide are relatively newly discovered hormones of the pancreas, and both are still being studied.

Posted Date: 10/2/2012 7:03:07 AM | Location : United States







Related Discussions:- Hormones of pancreas, Assignment Help, Ask Question on Hormones of pancreas, Get Answer, Expert's Help, Hormones of pancreas Discussions

Write discussion on Hormones of pancreas
Your posts are moderated
Related Questions
Determine the Symptoms of Shigellosis Symptoms:  Pathogenicity involves the release of lipopolysaccharide endotoxin, which infects the intestinal mucosa. Shigellosis ranges fro

what is the excretory organ of lizard

Explain the Plating Method - Pure Culture Techniques? Plating method is one of the commonly employed methods for getting a pure culture.  The procedure involves the separation

Q. What is Goitrogens anti-thyroid substance? Ans. Goitrogenslanti-thyroid substances present in certain plant foods have been found to interfere with the uptake of iodine

Define about the Photometry - colorimetry? Photometry is the measurement of the luminous intensity light or the amount of luminous light falling on a surface from such a source

Which of the following processes in capillaries in the lung assist in the removal of carbon dioxide from the body? A. Net flux of bicarbonate from plasma into red blood cells.

Q. What is the use of Uncoated polyvinyl chloride? Uncoated polyvinyl chloride (PVC) and polyvinylidene chloride (PVDC): PVC and PVDC are closely related plastics that are a

Explain about Hypothalamus Another important part of brain is hypothalamus. It is very small in sie. It controls many important functions which are as follows:  Blood pre

Explain in brief about  the term - Calcium   Calcium is absorbed as Ca 2+ ion and is a constituent of cell wall, an activator of different plant enzymes and is essential for t

Aerobic Based Water Treatment: Waste water provides organic materials and inorganic nutrients to river waters; this is known as eutrophication. This promotes microbial and plan