Human Body. Facts For You. The human nose can detect over 1 trillion different scents, making it one of the most powerful sensory organs in the body. The human brain produces enough electricity to power a small light bulb. The small intestine is approximately 22 feet long, making it the longest part of the digestive system. The human body contains enough fat to make seven bars of soap. The strongest muscle in the human body is the masseter muscle, which is responsible for chewing. Humans shed around 600,000 particles of skin every hour, which amounts to approximately 1.5 pounds of skin per year. The human eye can distinguish approximately 10 million different colors. The average human produces enough saliva in their lifetime to fill two swimming pools. The adult human body is made up of approximately 100 trillion cells. The surface area of the human lungs is approximately 70 square meters, which is about the size of a tennis court .