Glucose can be stored as glycogen in:

Glycogen is the stored form of glucose in the body, and the liver plays a crucial role in this process. When the body has an excess amount of glucose, it converts this glucose into glycogen through a process known as glycogenesis. The liver can store a significant amount of glycogen, which serves as a readily available energy reserve for the body. This stored glycogen can be quickly converted back to glucose when needed, especially during periods of fasting or intense physical activity.

The pancreas, while important for regulating blood sugar levels through hormone production (like insulin), does not store glycogen. The heart and stomach also do not serve as storage sites for glycogen. The heart primarily uses glucose and fatty acids for energy during its functioning, while the stomach is involved in the digestion process and not in energy storage. Hence, the liver is indeed the correct choice for where glucose is stored as glycogen.