In Islets of Langerhans, the 'hypoglycemic hormone' is secreted by

$\mathrm{\beta }\text{-cells }$of Islets of Langerhans (pancreas) secrete insulin. It acts mainly on hepatocytes and adipocytes (cells of adipose tissue), and enhances cellular glucose uptake and utilisation. As a result, there is a rapid movement of glucose from blood to hepatocytes and adipocytes resulting in decreased blood glucose levels (hypoglycemia). Insulin also stimulates conversion of
glucose to glycogen (glycogenesis) in the target cells. Hence, it is a hypoglycemic hormone.