The world's largest internal organ is the liver, which weighs approximately 3 to 3.5 pounds in adults. Located in the upper right quadrant of the abdomen, the liver performs vital functions that are crucial for survival. It processes nutrients absorbed from the digestive tract, produces bile for digestion, detoxifies harmful substances, and regulates blood sugar levels. The liver also synthesizes important proteins, including those involved in blood clotting. Its regenerative capacity allows it to recover from damage, but chronic conditions, such as hepatitis or fatty liver disease, can impair its function and overall health.