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Q.
How many kinds of cells are found in islets Langerhans?
Chhattisgarh PMTChhattisgarh PMT 2005
Solution:
Islets of Langerhans forms an endocrine part of pancreas. Paul Langerhans $(1869)$ discovered this. Each pancreatic islet includes four types of hormone secreting cells : These are :
(i) $\alpha$ or $A$ cells-constitue about $15\%$ of pancreatic islet cells and secrete glucagon.
(ii) $\beta$ or $B$ cells-constitute about $80 \%$ of pancreatic islet cells and secrete insulin.
(iii) $\delta$ or $D$ cellsconstitute about $5 \%$ of pancreatic islet cells and secrete somatostatin (identical to growth hormone-inhibiting secreted by the hypothalamus).
(iv) $F$ cells-constitute the remainder of pancreatic islet cells and secrete pancreatic polypeptide.