Question

which source of energy is normally used for short bursts of activity?
lipids
protein
glycogen
lactic acid

Explanation:

Glycogen is a stored form of glucose. When the body needs energy for short - burst activities (such as sprinting), glycogen is broken down into glucose. Glucose then enters glycolysis to produce ATP (adenosine triphosphate), the energy currency of the cell. Lipids are more for long - term energy storage. Proteins are mainly for building and repairing tissues and are not the primary source for short - burst energy. Lactic acid is a by - product of anaerobic glycolysis (which occurs during intense short - burst activities when oxygen is limited), but it is not the energy source itself.

Answer:

glycogen