What is the function of glucagon in the body?

Glucagon is a hormone produced by the alpha cells of the pancreas, and its primary function is to help maintain blood glucose levels, particularly when they are low. When blood sugar levels drop, glucagon is released into the bloodstream, signaling the liver to convert stored glycogen back into glucose. This process, known as glycogenolysis, releases glucose into the bloodstream, effectively raising blood sugar levels and ensuring that the body has a readily available source of energy. This action is essential for maintaining normal metabolic processes and providing energy to cells, especially during fasting or periods of low carbohydrate intake.

The options concerning fat digestion and protein synthesis are unrelated to the primary function of glucagon. Glucagon does not assist with fat digestion, nor does it directly contribute to protein synthesis; instead, its main role revolves around glucose metabolism and blood sugar regulation.