Which storage form of glucose is predominantly found in liver and muscle?

• A. Glucose
• B. Starch
• C. Glycogen
• D. Fructose

Answer: (C)

Glycogen is the storage form of glucose in liver and muscle. It’s a highly branched polymer that can be quickly broken down when energy is needed. In the liver, glycogen breakdown releases glucose into the bloodstream to help maintain blood glucose levels between meals. In muscle, glycogen provides glucose for local energy during activity, but it isn’t released into the blood because muscle lacks the enzyme needed to export glucose. Free glucose isn’t stored long-term, starch is a plant storage carbohydrate, and fructose is a simple sugar, not a stored polymer in humans.