What is the largest organ in the human body?

The skin is recognized as the largest organ in the human body, covering the entire exterior and serving multiple critical functions. It plays a vital role in protecting internal organs, regulating body temperature, and enabling sensory perception. Composed of multiple layers including the epidermis, dermis, and subcutaneous tissue, the skin has a total area of approximately 1.5 to 2 square meters in adults, depending on body size.

In contrast, while the liver is the largest internal organ and performs essential metabolic functions, it does not surpass the skin in size. The heart, a muscular organ responsible for pumping blood throughout the body, is also smaller than the skin. The lungs, which facilitate gas exchange and respiration, are important for respiratory function but are not larger than the skin either. Thus, the classification of skin as the largest organ is based on its extensive coverage and multifaceted roles in maintaining overall health.