A 25-year-old woman presents with intermittent symptoms of sweating, palpitations, and hunger. During each episode, her glucose level is less than 40 mg/dL. Her insulin level is low and glucagon level is high. Which of the following best describes the hormone function of glucagon?
promotes glycogenolysis and gluconeogenesis a carbohydrate in structure effective in lowering blood sugar levels antigenically similar to insulin