Final answer:
Insulin and glucagon control glycogen breakdown and synthesis, affecting blood sugar levels and glucose utilization in tissues.
Step-by-step explanation:
Insulin and glucagon control glycogen breakdown and synthesis, affecting blood sugar levels and glucose utilization in tissues. Insulin reduces blood glucose levels by stimulating the metabolism of glucose for energy production, converting excess glucose into glycogen for storage, and inhibiting enzymes involved in glycogenolysis and gluconeogenesis. On the other hand, glucagon raises blood glucose levels by stimulating glycogenolysis and gluconeogenesis, releasing glucose into the blood.