Final answer:
Glucose is the primary sugar that can be used as an energy source in the body. It is absorbed into the bloodstream after digestion and is converted into energy (ATP) through the process of glycolysis or stored as glycogen and fat.
Step-by-step explanation:
Sugars are absorbed from the blood in many forms, however only glucose can be used as an energy source. After digestion breaks down polysaccharides into monosaccharides, glucose is transported into the bloodstream.
Cells uptake glucose and use a process called glycolysis to convert glucose into ATP, the energy currency of the cell.
Glucose not immediately used for energy can be stored as glycogen in the liver and muscles, or converted into fat in adipose tissues. The digestion and absorption of carbohydrates ensures that glucose is available for cellular functions, while excess glucose is efficiently stored for future use.