I was taught that islet alpha cells will not release glucagon if there is insulin present in the blood. In a normal person pancreatic delta cells would produce stomatostatin which signals the pancreatic beta cells to stop producing insulin, and if bg went too low after stopping insulin production the alpha cells would secrete glucagon. Glucagon is the best pathway to raise blood sugar second to ingesting sugar, but thought that it was only other pathways (that are not as effective) like the release of adrenaline and gluconeogenesis that can raise blood glucose when sugar is low and insulin is present. To be honest though, I pathetically am not sure how this works in a diabetic, but hope to soon find out
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