Which statement accurately describes the role of glucagon?

Glucagon is a critical hormone produced by the alpha cells in the pancreas, and its primary function is to raise blood glucose levels, especially during fasting states or when blood sugar levels drop too low. When blood glucose levels begin to decline, glucagon is released into the bloodstream, signaling the liver to convert stored glycogen into glucose, which is then released into the bloodstream. This process, known as glycogenolysis, helps to ensure that the body has a continuous supply of glucose for energy, particularly for vital organs such as the brain.

In addition to promoting glycogenolysis, glucagon can also stimulate gluconeogenesis, a metabolic pathway that generates glucose from non-carbohydrate sources, further aiding in the increase of blood glucose levels. This is vital in maintaining homeostasis, especially during times of stress or energy deficit.

In contrast, the other statements refer to processes or effects that are not associated with glucagon’s function. For example, lowering blood glucose levels and promoting glycogen storage are functions associated with insulin, while stimulating insulin secretion does not align with glucagon’s role, as glucagon is released when insulin levels are low to counteract the effects of low blood sugar. Thus, the accurate description of glucagon's role is