PANCREAS ::
It is a mixed type of gland consisting of two parts :exocrine part and the endocrine part The bulk of the pancrease consists of glandular acini which secrete a powerful digestive juice into the gut This is the exocrine part of the pancreas Scattered amongst the acini are tiny clumps of cells known as the islets of Langerhans This is the endocrine part of the pancreas There are two types of cells in the islets of Langerhans .
(1) The large and peripheral alpha (a) cells which secrete the polypeptide glucagon
(2) The smaller beta (b) cells which are clumped around capillaries and secrete the insulin It increases with rise in glucose levels in the blood
(3) In addition to a and b cells there are so called $ (delta ) cells which contain less dense granules and whose function is still not known
Glucagon and insulin are the principal hormones controlling the blood sugar level Glucagon increases the blood sugar (glucose) level whereas insulin decreases the blood sugar level
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