Which source of energy is normally used for short bursts of activity?

a. lipids

b. protein

c. glycogen

d. lactic acid

The answer is c. glycogen.

Glycogen serves as energy storage in animals, mainly present in liver cells and muscles. Carbohydrates consist of more C-H bonds which contain potential energy, so they can serve as energy storage. When energy is needed immediately, glycogen breaks down to glucose. Thus, the great amount of energy is released, and the glucose level in blood is maintained as well.