Glucagon.
The hormone that signals the release of glucose from storage is glucagon. Glucagon is produced by the alpha cells of the pancreas and works to increase blood glucose levels when they are low, such as during fasting or between meals.
The hormone glucagon stimulates the liver to release glucose into the blood when glucose levels are low.
The hormone glucagon converts stored glycogen into glucose, which can be transported in the bloodstream.
Liver
Glucagon is a hormone that helps increase blood glucose levels by signaling the liver to release stored glucose into the bloodstream. This process is important for maintaining blood sugar levels within a healthy range, especially during times of fasting or low blood sugar.
The hormone Insulin regulates the body's glucose levels.
glucagon
glucagon
There is no single answer to this question, but one common aspect is that most hormone release is in somehow regulated by a negative feedback system. For example a hormone produces an effect that in turn inhibits the same hormone's release. There are also positive feedback loops as in the rise of glucose acting to increase insulin release which then lowers glucose levels.
The main hormone that signals the release of glucose into the blood is Glucagon, however, it is used in conjunction with other hormones which also cause a release of glucose into the blood. These are somatostatin, Adrenaline (epinephrine for Americans), Cortisol and ACTH.
The hormone that fits this description is cortisol. Cortisol is a stress hormone that promotes the breakdown of proteins into amino acids to increase fatty acid release and stimulate gluconeogenesis (glucose synthesis) in the liver.
Glucagon is a hormone that increases blood sugar levels by signaling the liver to release stored glucose into the bloodstream. This helps to raise blood sugar levels when they are too low, such as during fasting or exercise.