Does Glucagon Increase Blood Glucose?

Does Glucagon Increase Blood Glucose?

Yes, glucagon increases blood glucose. It is a peptide hormone produced by alpha cells in the pancreatic islets, and its primary role is to raise blood sugar when it falls too low. It does this mainly by acting on the liver, prompting the release of stored glucose into the bloodstream.

How Glucagon Raises Blood Sugar

Glucagon binds to receptors on liver cells and activates signaling pathways that break down glycogen, the stored form of glucose, into free glucose that can enter the blood. It also stimulates gluconeogenesis, the production of new glucose from non-carbohydrate sources such as amino acids and lactate. These two processes work together to restore blood glucose levels during fasting, intense exercise, or hypoglycemic episodes.

When Glucagon Acts

Glucagon secretion rises when blood glucose drops, such as between meals or during prolonged exercise. It is part of a counter-regulatory system alongside cortisol, epinephrine, and growth hormone. In healthy individuals, this system prevents dangerous lows. In people with diabetes, especially type 1, the balance can be disrupted, making glucagon responses less reliable during hypoglycemia.

Glucagon in Diabetes and Treatment

People with diabetes may use injectable glucagon or nasal glucagon to treat severe hypoglycemia when oral sugar is not possible or safe. Because glucagon can cause nausea and vomiting, it should be administered with the person lying on their side. Understanding that glucagon increases blood glucose helps caregivers act quickly and appropriately during an emergency.

Key Takeaways

• Glucagon is released by pancreatic alpha cells to raise low blood sugar.
• It works by breaking down liver glycogen and producing new glucose.
• It is a rescue treatment for severe hypoglycemia in diabetes.
• Side effects are usually mild but include nausea and abdominal discomfort.