Briefly explain about pancreas.

Explanation

Pancreas : It lies in the concavity of duodenum. The pancreas is a heterocrine gland having 60g weight and 16 cm length. Its parts are head, body and tail. The pancreas has two types of cells:
(a) Pancreatic gland cells : These cells secrete enzymes.
(b) Islets of Langerhans : These cells are further of following types:

(1) Alfa cells : These secrete glucagon. The glucagon converts glycogen into glucose. This process is called glycogenolysis.
(ii) Beta cells: These secrete insulin. It converts glucose to glycogen in liver. This process is called glycogenesis.
(iii) Delta cells : These secrete somatostanin hormone which controls the rate of absorption of food.
(iv) F cells: They secrete polypeptide hormone (PPH) which checks secretion of pancreatic juices.