Where is glycogen stored to provide energy for performance?

• A. Liver
• B. Blood
• C. Muscle
• D. Adipose tissue

Answer: (C)

Glycogen acts as a quick energy reserve, and for performance the key source is glycogen stored in skeletal muscle. This local store can be rapidly broken down into glucose-6-phosphate and fed directly into glycolysis to meet the muscle’s needs during contraction, especially in high‑intensity efforts. The liver also stores glycogen, but its role is to release glucose into the bloodstream to keep blood glucose stable for the whole body, not to supply energy directly to the contracting muscles. Adipose tissue stores fat, not glycogen, and blood isn’t a glycogen storage site. So, the glycogen that provides energy for performance is stored in the muscle.