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प्रश्न
Write a note on the four different kinds of cell in Pancreas.
Mention the three types of cells 'of the islets of Langerhans and the name of the hormone they secrete.
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उत्तर
Islets of Langerhans are endocrine cells of pancreas. They are four types of cells in Islets of Langerhans which have endocrine role i.e. they secrete hormones.
- Alpha cells (α cells): They constitute 20% of Islets of Langerhans. They secrete hormone glucagon. Glucagon stimulates glycogenolysis (breakdown of glycogen) in liver which may cause hyperglycemia.
- Beta cells (β cells): They constitute 70% of Islets of Langerhans. They secrete insulin which stimulates glycogenesis (formation of glycogen) in liver and muscles. Insulin causes hypoglycemia by increasing uptake of glucose by cells.
- Delta cells (δ cells): They constitute 10% of Islets of Langerhans. These cells secrete somatostatin which inhibits the secretion of insulin and glucagon. It also lowers the gastric secretions, motility and absorption in digestive tract. Somatostatin inhibits the release of growth hormone.
- PP cells or F cells: These cells secrete pancreatic polypeptide (PP) and inhibit the release of pancreatic juice.
Notes
Students should refer to the answer according to their questions.
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संबंधित प्रश्न
Briefly explain the following terms: Hormone
The hormone secreted by islets of langerhans.
Cretinism and Myxoedema are due to
A. Hypersecretion of thyroxin
B. Hypersecretion of growth hormone
C. Hyposecretion of thyroxin
D. Hyposecretion of growth hormone
Explain Hormones.
Match the items given in Column A with the most appropriate ones in Column B and rewrite the correct matching pairs
| Column A | Column B | ||
| 1 | Cretinism | a | Hypersecretion of the adrenal cortex |
| 2 | Diabetes insipidus | b | Hyposecretion of Thyroxine |
| 3 | Exophthalmic Goitre | c | Hyposecretion of growth hormone |
| 4 | Adrenal virilism | d | Hyposecretion of Vasopressin |
| 5 | Dwarfism | e | Hyposecretion of the adrenal cortex |
| f | Hypersecretion of Growth hormone | ||
| g | Hypersecretion of thyroxine |
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