When blood glucose in a human drops to ____ mg/100 mL (the hypoglycemic condition, normal: 60 to 90 mg/100 mL), the person experiences discomfort and mental confusion; further reductions lead to coma, convulsions, and, in extreme hypoglycemia, death. Maintaining the normal concentration of glucose in blood is therefore a high priority, and a variety of regulatory mechanisms have evolved to achieve that end. Among the most important regulators of blood glucose are the hormones insulin, glucagon, and epinephrine