Which of the following is NOT a function of glucagon?

Glucagon is a hormone produced by the alpha cells of the pancreas that primarily functions to increase blood glucose levels when they are low. One of its key roles is to promote the conversion of glycogen, stored in the liver, into glucose through a process known as glycogenolysis. This released glucose then enters the bloodstream, helping to raise blood sugar levels.

Additionally, glucagon stimulates gluconeogenesis, the metabolic process that synthesizes glucose from non-carbohydrate precursors, ensuring that the body has a steady supply of glucose even during fasting or low-carbohydrate intake.

The correct answer indicates that lowering blood sugar levels is not a function of glucagon. Instead, glucagon's primary role is to counteract low blood sugar levels by raising them. Thus, option B, stating that glucagon lowers blood sugar levels, misrepresents the physiological role of this hormone and is therefore not a function of glucagon. Glucagon's main functions are centered on elevating blood sugar levels to maintain homeostasis, especially in response to hypoglycemia.