The pancreas contains different types of cells. These cell clusters are called islets of Langerhans. It contains alpha cells, beta cells, gamma cells, delta cells, P.P. (pancreatic polypeptide) cells etc. The hormones secreted from this gland are-
(i) Glucagon: Glucagon hormone is secreted from alpha cells. It increases blood glucose levels.
(ii) Somatostatin: Somatostatin hormone is secreted from delta cells. It inhibits gastrin secretion.
(iii) Gastrin: Stimulates the secretion of pepsin, secretin and HCl.
(iv) Insulin: Insulin hormone is secreted from beta cells. It lowers blood glucose levels.