How does the release of glucagon affect blood glucose levels

Glucagon refers to the hormones that instruct the cells in the muscles and liver to transform glycogen into glucose and discharge it within the blood so that it can be used further for energy purposes. The main function of glucagon is to compensate for the work done by insulin.  

The concentration of glucose within the blood gets reduce after 4-6 hours of eating something. This reduction in the level of glucose signals the pancreas to discharge glucagon. As the hormone gets released, it instructs the cells of muscles and liver to convert the glycogen storage into the molecules of glucose. The produced glucose then further gets discharged into the bloodstream and serves the purpose of providing energy.  

sorry, is there a picture? i do not see any arrows.

wut? unius0123 wut?