What is the primary function of glycogen in the body?

The primary function of glycogen in the body is energy storage, particularly in the muscles and liver. Glycogen is a polysaccharide that serves as a form of carbohydrate storage in animals, allowing the body to maintain adequate glucose levels for energy production during physical activity and times of fasting. When the body requires energy, glycogen can be rapidly broken down into glucose molecules, which are then utilized to fuel cellular processes, especially in muscle tissues during exercise.

In the liver, glycogen plays a crucial role in regulating blood glucose levels, as it can be converted back into glucose and released into the bloodstream to maintain homeostasis. This function is vital for sustaining energy levels during periods of increased demand, such as exercise or between meals.