During an overnight fast, glucagon secretion increases to help maintain plasma glucose levels. Which of the following actions is NOT a mechanism by which glucagon elevates blood glucose?

• A. Stimulating glycogen breakdown in the liver
• B. Promoting gluconeogenesis from amino acids and other substrates
• C. Increasing glucose uptake by skeletal muscle and adipose tissue
• D. Enhancing the release of glucose from the liver into the bloodstream

Answer: (C)