From which cells or islets of langerhans the glucagon andinsulin are secreted? how tdo their effects are antagonistoc

I think this may be the answer

Explanation:

The islets of Langerhans contain alpha cells which secrete glucagon and beta cells which secrete insulin. Insulin and glucagon are hormones that work to regulate the level of sugar (glucose) in the body to keep it within a healthy range.

this is a good question! i'll do some research and come back when i have the answer!