Final answer:
True. Glucagon stimulates glycogenolysis, gluconeogenesis, and ketone formation in the liver.
Step-by-step explanation:
True. Glucagon acts primarily on the liver, stimulating glycogenolysis, gluconeogenesis, and ketone formation. It stimulates the liver to convert its stores of glycogen back into glucose, a process known as glycogenolysis. Glucagon also stimulates the liver to take up amino acids from the blood and convert them into glucose, a process called gluconeogenesis. Additionally, glucagon stimulates the breakdown of stored triglycerides into free fatty acids and glycerol, which can be converted into glucose by the liver.