Which endocrine hormone promotes the release of glucose from the liver into the bloodstream?

• A. Glucagon
• B. Insulin
• C. Thyroxine
• D. Cortisol

Answer: (A)

Verified step by step guidance

1. Understand the role of the liver in glucose metabolism: The liver stores glucose in the form of glycogen and releases it into the bloodstream when needed.
2. Identify the hormones involved in glucose regulation: Glucagon and insulin are the primary hormones that regulate blood glucose levels.
3. Examine the function of glucagon: Glucagon is a hormone produced by the alpha cells of the pancreas. It promotes the conversion of glycogen to glucose in the liver, increasing blood glucose levels.
4. Contrast glucagon with insulin: Insulin, produced by the beta cells of the pancreas, facilitates the uptake of glucose by cells and promotes the storage of glucose as glycogen, lowering blood glucose levels.
5. Consider other hormones: Thyroxine and cortisol also affect metabolism, but they do not directly promote the release of glucose from the liver like glucagon does.