Where is glycogen primarily stored in the body?

Glycogen is primarily stored in the liver, which plays a crucial role in regulating blood glucose levels. The liver can convert glycogen back into glucose and release it into the bloodstream when the body needs energy, especially during fasting or intense physical activity. This function helps maintain homeostasis and ensures that tissues receive adequate glucose for energy.

Muscle tissue also stores glycogen, but its primary function is to provide energy directly to the muscles during exercise, rather than to regulate blood glucose levels for the entire body. The pancreas is involved in hormone regulation, particularly insulin and glucagon, but it does not store glycogen. The lungs do not store glycogen at all; their primary function is gas exchange. Therefore, the liver is the most significant storage site for glycogen in the body.