What does glucagon do in relation to blood sugar?

Glucagon plays a crucial role in regulating blood sugar (glucose) levels, particularly during periods when blood sugar is low. It is a hormone produced by the alpha cells of the pancreas. When blood glucose levels drop, such as between meals or during fasting, glucagon is released into the bloodstream.

The primary action of glucagon is to stimulate the liver to convert stored glycogen back into glucose through a process called glycogenolysis. This process then releases glucose into the bloodstream, effectively increasing blood sugar levels. Additionally, glucagon promotes gluconeogenesis, which is the production of glucose from non-carbohydrate sources in the liver.

In this context, the answer indicating that glucagon increases blood sugar is correct, as its primary function is to raise blood glucose levels when they are low, ensuring that the body's cells have the necessary energy to function properly.