Answer: The correct answer for the fill in the blank is- Liver.
Liver is an organ that receives digested food components through bloodstream and stores the glucose as glycogen.
In other other words, glycogen is the stored form of glucose that is broken down whenever there is a demand of energy in the body. Glucagon is a hormone that is released by pancreas whenever there is low level of glucose in the blood. It stimulates the process of glycogenolysis ( that is the breakdown of glycogen to obtain glucose).
