Question

Islets of Langerhans produce
(a) Insulin
(b) Rennin
(c) Ptyalin
(d) HCl

Answer 1

Hint: The asked hormone reduces the sugar content in the blood and thus acts antagonist to the glucagon. It promotes glucose uptake, glycogenesis, and also protein synthesis in the skeletal muscles.

Complete answer:
Islets of Langerhans also called pancreatic islets, are the regions found in the pancreas that contain some hormone-producing cells, out of which the beta cells produce insulin, and the hormones produced by these cells are secreted directly in the bloodstream that means these are endocrine. Different types of hormone-producing cells and their respective hormones are as follows :
Alpha cells – these cells produce glucagon that prevents blood glucose levels from dropping too low by converting the glycogen that is stored in the liver to glucose and then it is released into the bloodstream.
Beta cells – these cells produce insulin that reduces the sugar content in the blood and thus acts antagonist to the glucagon. It promotes glucose uptake, glycogenesis, and also protein synthesis in the skeletal muscles.
Delta cells – these cells produce somatostatin that regulates the endocrine system.
Epsilon cells – these cells produce ghrelin which is also called the hunger hormone.
Gamma cells – these cells produce pancreatic polypeptides.
So, the correct answer is ‘Insulin’.

Note:
Rennin is a protein-digesting hormone secreted by the chief cells in the stomach of some animals that digest milk, especially in the young ones while ptyalin is a form of amylase that is found in the saliva of some animals and humans also.