using the following graph, which of the following is a correct statement? insulin infusion affected not only glucose concentration in patients with diabetes but also affected their glucagon concentration. at 220 minutes after a meal glucagon concentration is decreasing as insulin concentration is increasing. before the insulin infusion the blood glucose concentration after 60 minutes in patients with diabetes was equivalent to the blood glucose concentration in patients without diabetes. at 60 minutes when the glucose and glucagon concentrations are at their highest level,the insulin concentrations whereat their lowest in patients without diabetes.