What is the largest organ of the body?

The skin is the largest organ of the body, serving as a vital barrier between the body's internal systems and the external environment. It performs essential functions, including protection against pathogens, regulation of temperature, and sensation. Covering a surface area that can range from 1.5 to 2 square meters in adults, the skin accounts for about 15% of a person's body weight. Additionally, it plays a crucial role in preventing dehydration and helps synthesize vitamin D when exposed to sunlight.

The heart, liver, and brain, while crucial to the body’s overall functioning, are not considered organs by surface area or weight in the same way that the skin is. The heart is vital for pumping blood, the liver is essential for detoxification and metabolism, and the brain is responsible for processing information and coordinating actions. However, none of these organs surpass the skin in terms of size, making the skin the largest organ in human anatomy.