What does glucagon do when the body requires glucose?

The function of glucagon in the body is crucial, especially when glucose levels drop and energy is needed. When the body requires glucose, glucagon acts primarily to bring glucose out of storage. It is a hormone produced by the alpha cells of the pancreas, and its primary role is to raise blood sugar levels when they are too low.

Glucagon prompts the liver to convert glycogen, which is stored glucose, back into glucose through a process called glycogenolysis. It may also stimulate gluconeogenesis, where the liver produces glucose from non-carbohydrate sources. This release of glucose into the bloodstream helps to ensure that the body's tissues, especially the brain, have the energy they need to function properly.

In contrast, the other options do not accurately represent the role of glucagon during times when the body needs glucose. While increasing appetite might be a response to low energy levels, it isn’t a direct action of glucagon. Storing excess glucose as fat is a function associated with insulin, not glucagon, as insulin encourages the storage of glucose. Reducing blood sugar levels is also contrary to the action of glucagon, as it is intended to raise blood sugar when needed. Therefore, the correct choice highlights glucagon's role in