What is the role of glucagon in emergency medicine?

Glucagon plays a crucial role in emergency medicine by raising blood glucose levels. It is a hormone produced by the pancreas that stimulates the liver to convert stored glycogen into glucose, which is then released into the bloodstream. This mechanism is particularly important in situations of hypoglycemia, such as in diabetic patients who have taken too much insulin or have not eaten enough. Administering glucagon can quickly increase blood sugar levels, providing essential energy to the body and preventing severe complications such as loss of consciousness or seizures.

In contrast to the other roles described in the options, glucagon does not function to decrease heart rate, promote digestion, or prevent seizures. It is primarily focused on mobilizing glucose reserves to ensure that the body can maintain adequate levels of this vital energy source during emergencies.