The primary storage form of glucose in the body is called what?

The primary storage form of glucose in the body is glycogen. Glycogen is a polysaccharide that is mainly found in the liver and muscles. When the body has an excess of glucose, it converts this surplus into glycogen through a process known as glycogenesis. This stored glycogen can later be converted back into glucose when the body needs energy, particularly during periods of physical activity or fasting.

In contrast, glucose itself is the simple sugar that serves as an immediate source of energy for the body's cells, but it is not a storage form. Starch is a form of carbohydrate storage found in plants, not in human physiology. Fructose, another type of sugar found in fruits, is metabolized differently and does not serve as a primary storage form for glucose in the body. Therefore, glycogen is the correct answer as it directly relates to how the body efficiently stores and mobilizes glucose when needed.