Figure 11.Plasma glucose, insulin, glucagon, epinephrine, norepinephrine, cortisol, and growth hormone concentrations and overall symptom score. o, euglycemia; *, hypoglycemia. (Copyright 1991 by the American Physiological Society. Republished with permission of the American Physiological Society from Mitrakou et al. Hierarchy of glycemic thresholds for counterregulatory hormone secretion, symptoms, and cerebral dysfunction. Am J Physiol 260:E67-E74, 1991.)