NCSF Sport Nutrition Specialist Certification Practice Test – Complete Exam Prep

Glycogen is primarily stored in the muscle and liver. The muscles store glycogen to use as a rapidly available source of energy during physical activity, which is essential for maintaining performance during exercise. The liver, on the other hand, stores glycogen for use in regulating blood glucose levels between meals, making it crucial for maintaining energy balance throughout the day.

The muscles hold a larger quantity of glycogen than the liver, which makes muscular glycogen important for athletes and active individuals. The liver's glycogen stores are vital for providing glucose to the bloodstream, helping to maintain energy levels during low-intensity activities or when fasting.

The other options include organs that are not primary storage sites for glycogen. The pancreas is involved in hormone regulation, particularly insulin and glucagon, which play roles in blood sugar levels but do not store glycogen. The kidneys also have a role in overall metabolism but do not serve as significant glycogen storage sites. The heart uses energy primarily from fatty acids and has limited glycogen storage compared to muscles and liver.