Pancreas or Islets of Langerhans Cells


 
 
Concept Explanation
 

Pancreas or Islets of Langerhans Cells

Islets of Langerhans cells of Pancreas : The pancreas is a digestive gland located in the C-shaped bend of the duodenum. Inside this gland there are groups of hormone-secreting cells. These groups are called the islets of Langerhans. The islet of pancreas consist of different type of cells : alpha, beta and gamma cells. The alpha cells secrete glucagon hormone which increases the blood glucose level. The beta cells secrete an important hormone called as insulin which help in decreasing blood sugar level. On the other hand the beta cells secrete somatostatin hormone.The function of this hormone is still unknown. 

Insulin controls the rate of oxidation of glucose. It helps the liver and muscle cells to absorb glucose from the blood. It also controls the formation of glycogen from glucose in the liver.

People who are unable to secrete sufficient insulin suffer from a condition called diabetes mellitus. The level of glucose in their blood keeps on rising, and after a limit the kidney lets the extra glucose be excreted with urine. Doctors advise diabetics to take less sugar in their diet. Some diabetics are advised to take injections of insulin, if they have very high levels of blood sugar. High levels of blood sugar harm the body in many ways.

                             

Sample Questions
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Question : 1

Islets of langerhans secrete insulin and _____________

Right Option : A
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Explanation
Question : 2

The glands with both exocrine and endocrine function is _____________

Right Option : B
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Explanation
Question : 3

Which of the following compounds is involved in decreasing blood glucose levels?

Right Option : A
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Explanation
 
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