"Glucagon secretion" refers to the process of the hormone glucagon being released into the bloodstream. Glucagon works to increase the amount of sugar in the blood by signaling the liver to convert stored glycogen into glucose. Full definition
Although a relative or absolute deficiency of insulin action in response to a rising extracellular glucose concentration has long been recognized as the major hormonal abnormality, the importance of an absolute or relative increase of glucagon secretion has been appreciated more recently. (merckvetmanual.com)