What is an effect of glucagon on the body?

• A. It promotes the storage of fat.
• B. It increases blood glucose levels.
• C. It decreases energy expenditure.
• D. It slows down metabolic processes.

Answer: (B)

Glucagon is a hormone produced by the alpha cells of the pancreas that plays a crucial role in maintaining blood glucose levels, especially during fasting or periods of low carbohydrate intake. When blood glucose levels drop, glucagon is released into the bloodstream, signaling the liver to convert stored glycogen into glucose through a process known as glycogenolysis. This process releases glucose into the bloodstream, which increases blood glucose levels and helps provide the body with the necessary energy between meals.

The role of glucagon is particularly important because it counteracts the effects of insulin, which lowers blood glucose levels. By promoting the release of glucose into the bloodstream, glucagon ensures that the body's tissues, especially the brain, have a continuous supply of energy. This action is vital for maintaining homeostasis and proper metabolic function.