How does glucagon influence pyruvate kinase activity in the liver during low blood sugar conditions?

• A. Glucagon activates pyruvate kinase, increasing glycolysis.
• B. Glucagon inhibits pyruvate kinase, reducing glycolysis.
• C. Glucagon has no effect on pyruvate kinase activity.
• D. Glucagon enhances pyruvate kinase activity.

Answer: (B)