Glycogen is the storage form of glucose in which tissues?

Glycogen is the storage form of glucose in which tissues?

• A. Liver and muscles
• B. Brain
• C. Heart
• D. Kidneys

Answer: (A)

Glycogen is the storage form of glucose in animals, stored primarily in the liver and skeletal muscle. The liver keeps glycogen to maintain blood glucose during fasting or between meals; when needed, liver cells convert glycogen-derived glucose-6-phosphate into free glucose and release it into the bloodstream. Muscle glycogen, on the other hand, is reserved for the muscle’s own energy needs during activity and cannot supply glucose to the blood because muscle tissue lacks the enzyme to convert glucose-6-phosphate to free glucose. While the brain, heart, and kidneys use glucose and may have some glycogen, they are not the main storage sites.

Glycogen is the storage form of glucose in animals, stored primarily in the liver and skeletal muscle. The liver keeps glycogen to maintain blood glucose during fasting or between meals; when needed, liver cells convert glycogen-derived glucose-6-phosphate into free glucose and release it into the bloodstream. Muscle glycogen, on the other hand, is reserved for the muscle’s own energy needs during activity and cannot supply glucose to the blood because muscle tissue lacks the enzyme to convert glucose-6-phosphate to free glucose. While the brain, heart, and kidneys use glucose and may have some glycogen, they are not the main storage sites.