Final answer:
The liver is responsible for the conversion of glycogen to glucose, a process that helps maintain blood sugar levels.
Step-by-step explanation:
The conversion of glycogen to glucose occurs in the liver. When the blood glucose level drops, the hormone glucagon is released, which then signals the liver to convert stored glycogen into glucose through a process known as glycogenolysis. This mechanism is crucial for maintaining blood sugar levels, especially during fasting or vigorous exercise. The liver serves a vital role by regulating the release of glucose and maintaining energy balance within the body.