Stored Metabolic Fuel in a 70-kg Person Energy (kJ/g dry Dry Weight Available Energy Constituent weight) (g) k Fat (adipose tissue) 37 15,000 555,000 Protein(muscle) 17 6,000 102,000 Glycogen (muscle) 16 120 1,920 Glycogen (liver) 16 70 1,120 Glucose (extracellular fluid) 16 20 320 Total 660.360 Scanning electron micrograph of an adipose cell (fat cell)Scanning electron micrograph of an adipose cell (fat cell)