Answer
(d) all of these
Work Step by Step
Hormones can target a specific organ to cause wider physiological effect such as prolactin which stimulates milk production during birth.
It can also turn an inactive enzyme into an active one such as pancreatic islets which produce pancreatic hormones .
The pancreatic islets are also a synthesis of two major populations of hormone-producing cells, the glucagon-synthesizing alpha (a) cells and the more
numerous insulin-synthesizing beta (β) cells
