Glucagon is secreted by which of the following?

Which hormone's presence is necessary in the target cells for glycogenesis?

If the pancreatic duct of a healthy dog is blocked an hour after it has had its food,which one of the following functions of the pancreas will not be affected?

In case the islets of $Langerhans$ stop functioning,which hormone will be in short supply and what will be its effect?

Insulin is secreted by

Which gland is responsible for the process of converting glucose into glycogen in the liver?